Thursday, November 01, 2007
Think And Grow Rich
Good Books: I recommend a timeless classic by Napoleon Hill, Think and Grow Rich. It is should be read time and time again.
Wednesday, October 31, 2007
The Myth Of The Robber Barons
Good Books: Myth of the Robber Barons by Burton Folsom provides an introduction to three of the greatest and most able businessmen who ever lived, Andrew Mellon, James Hill, and George Scranton + tips on how to run a business successfully + themes and case studies + invaluable lessons.
I enjoyed it.
I enjoyed it.
Autism
Sometimes it's hard to describe autistic behavior. We usually associate the medical condition with kids, but I have seen similar behavioral traits in adults. Sometimes we miss the red flags + normal behaviour variations spectrum . As they say, the moving picture speaks a million words.
Here is an interesting website: www.autismspeaks.org sponsored by two nonprofit advocacy groups: Autism Speaks and First Signs. They hope the site will promote early diagnosis and treatment.
Here is an interesting website: www.autismspeaks.org sponsored by two nonprofit advocacy groups: Autism Speaks and First Signs. They hope the site will promote early diagnosis and treatment.
Everyscape
New Business Models: According to industry analysts EveryScape’s business model is built around selling the interior views, called MiniScapes, to local businesses. The strategy of using ordinary pictures to populate the site and then using technology to knit the photos into a 3-D environment may build a loyal following. Good luck.
Useful link:
www.everyscape.com
Useful link:
www.everyscape.com
Lonely Prophets Of Pre-war Germany
The Economist writes about the new art dealers + gallery vs. auction houses + German Art (1919-1930) + other viewpoints @ http://www.economist.com/daily/columns/artview/displaystory.cfm?story_id=10048349
To Thine Own Selves Be True
Linda Yablonsky writes about role-playing concepts among artists + modern sensibilities + contemporary self-portraiture in painting, photography, and video + other viewpoints @ http://artnews.com/issues/article.asp?art_id=1418
Namibia And Diamonds
Namibia & diamonds
http://www.youtube.com/watch?v=YV8hLafmwpI
Namibia - Diamond industry
http://www.youtube.com/watch?v=pZeidtAYb9I
Demand for Namibian Diamonds
http://www.youtube.com/watch?v=VjemdIEa9dw
The videos were really educational. I enjoyed it.
http://www.youtube.com/watch?v=YV8hLafmwpI
Namibia - Diamond industry
http://www.youtube.com/watch?v=pZeidtAYb9I
Demand for Namibian Diamonds
http://www.youtube.com/watch?v=VjemdIEa9dw
The videos were really educational. I enjoyed it.
Roman Jewelers And Lapidaries
(via Roman Book On Precious Stones: 1950) Sydney H Ball writes:
In Pliny’s time, the jewelry trade was a thoroughly integrated industry, including traders, explorers like the equestrian sent northward in search of amber—the Jean Baptiste Tavernier of his time, brokers in precious stones, makers of false stones, lapidaries and gem engravers, setters, goldsmiths, silversmiths, and retail merchants.
In the Chou period (1000 B.C), the Chinese nobles despised trade and regarded merchants with contempt. The Greeks also disdained the tradesman, holding that haggling over profits made poor citizens. Cato (234-149 B.C), the Roman patriot, in the introduction to his treatise on agriculture, states that farming ‘makes the bravest men and the sturdiest soldiers.’ Trade may be more profitable than farming, but it is much more hazardous. However, ‘I think well of a merchant as a man of energy and studious of gain: but it is a career that leads to danger adn ruin.’ Cicero says of a tradesmen ‘they make no profit except by a certain amount of falsehood’ although business on a large scale, provided it was honorably conducted, ‘is not so very discreditable’ especially if after he has made his fortune the merchant retires and becomes a gentleman farmer. In the time of Augustus, similarly, the merchant, particularly the retailer, was held more or less in contempt by the Romans. In consequence, many of the merchants in Pliny’s time were not Romans but Greeks, and in his opinion also merchandising, the invention of the Phoenicians, was much less respectable than agriculture. Indeed, in his day, farming was the only respectable business.
Dionysius Periegetes, of about Pliny’s time, in his geographical poem, in which we find many references to gem occurrences, states that he is no merchant nor has he sailed the Indian Ocean ‘like the many who stake their lives for vast wealth.’
Saint John Chrysostom (347-407 A.D) expressed himself as follows: ‘Whoever buys a thing in order to make a profit selling it, whole and unchanged, is the trader who is cast out of God’s Temple.’ In the 14th century the merchant was scarcely to be distinguished from the pirate. Nietzche (1884-1900 A.D) says his morality was merely the refinement of that of a pirate.
Pliny, as we have said, did not highly regard those of the jewelry trade, and he evidently considered them a tricky crew. He emphasized their unwillingness to permit their clients to satisfy themselves of the genuineness of the wares offered. We, further, find the morals of the trade not high, for in the reign of that pervert Heliogabalus, Valerianus Vetus was executed for having designed and made small gold images, worn as ornaments by the ladies of pleasure. But there were exceptions for, dating from the days of Julius Caesar, there is an epitaph of a jeweler on the Via Sacra, perhaps written by relatives, which concludes: ‘He was compassionate and loved the poor,’ an eulogy many of us might covet.
Most authorities ascribe the motive of Lucius Piso, Governor of Further Spain, as recounted by Cicero, to his desire to be above all suspicion of dishonesty. I am rather inclined to ascribe it to his lack of faith in the uprightness of the artisan concerned. In going through his military exercises, he broke his ring—it probably being hollow and of fine, hence soft, gold. The governor summoned a goldsmith to his tribunal in the open forum of Corduba (Cordova), gave him the ring, weighed out the extra gold required for the job, and had the ring repaired in full view of the local populace. In Plutarch’s Essay, he speaks of the ‘impertinent labor of the goldsmith.’ In the Menaechmi, a comedy by Plautus (died 184 B.C), one of the women asks that her bracelet be taken to the goldsmith’s, that an ounce of gold be added to it, and that it be fashioned anew. Today, the wealthy Hindu, to protect himself, follows the procedure of Piso, for in India, likewise, the goldsmith is held in little esteem.
Theophrastus, writing about 315 B.C, mentions those stones which are cut as gems, some being so hard they cannot be cut with iron ‘but only by other stones’. Some sort of a lathe was even the used by lapidaries, as certain of the gems of that time have been shaped by the turner’s instruments. The carbuncle, emerald, and other stones, notably the stone from the ‘gold mines of Lampsacus used as a seal by the King’ (of Persia) were engraved as signets. Cutting the lapis lyncurius (tourmaline?) was difficult and workmanship was needed to bring out the luster of the emerald ‘for originally it is not so bright.’
Roman Jewelers And Lapidaries (continued)
In Pliny’s time, the jewelry trade was a thoroughly integrated industry, including traders, explorers like the equestrian sent northward in search of amber—the Jean Baptiste Tavernier of his time, brokers in precious stones, makers of false stones, lapidaries and gem engravers, setters, goldsmiths, silversmiths, and retail merchants.
In the Chou period (1000 B.C), the Chinese nobles despised trade and regarded merchants with contempt. The Greeks also disdained the tradesman, holding that haggling over profits made poor citizens. Cato (234-149 B.C), the Roman patriot, in the introduction to his treatise on agriculture, states that farming ‘makes the bravest men and the sturdiest soldiers.’ Trade may be more profitable than farming, but it is much more hazardous. However, ‘I think well of a merchant as a man of energy and studious of gain: but it is a career that leads to danger adn ruin.’ Cicero says of a tradesmen ‘they make no profit except by a certain amount of falsehood’ although business on a large scale, provided it was honorably conducted, ‘is not so very discreditable’ especially if after he has made his fortune the merchant retires and becomes a gentleman farmer. In the time of Augustus, similarly, the merchant, particularly the retailer, was held more or less in contempt by the Romans. In consequence, many of the merchants in Pliny’s time were not Romans but Greeks, and in his opinion also merchandising, the invention of the Phoenicians, was much less respectable than agriculture. Indeed, in his day, farming was the only respectable business.
Dionysius Periegetes, of about Pliny’s time, in his geographical poem, in which we find many references to gem occurrences, states that he is no merchant nor has he sailed the Indian Ocean ‘like the many who stake their lives for vast wealth.’
Saint John Chrysostom (347-407 A.D) expressed himself as follows: ‘Whoever buys a thing in order to make a profit selling it, whole and unchanged, is the trader who is cast out of God’s Temple.’ In the 14th century the merchant was scarcely to be distinguished from the pirate. Nietzche (1884-1900 A.D) says his morality was merely the refinement of that of a pirate.
Pliny, as we have said, did not highly regard those of the jewelry trade, and he evidently considered them a tricky crew. He emphasized their unwillingness to permit their clients to satisfy themselves of the genuineness of the wares offered. We, further, find the morals of the trade not high, for in the reign of that pervert Heliogabalus, Valerianus Vetus was executed for having designed and made small gold images, worn as ornaments by the ladies of pleasure. But there were exceptions for, dating from the days of Julius Caesar, there is an epitaph of a jeweler on the Via Sacra, perhaps written by relatives, which concludes: ‘He was compassionate and loved the poor,’ an eulogy many of us might covet.
Most authorities ascribe the motive of Lucius Piso, Governor of Further Spain, as recounted by Cicero, to his desire to be above all suspicion of dishonesty. I am rather inclined to ascribe it to his lack of faith in the uprightness of the artisan concerned. In going through his military exercises, he broke his ring—it probably being hollow and of fine, hence soft, gold. The governor summoned a goldsmith to his tribunal in the open forum of Corduba (Cordova), gave him the ring, weighed out the extra gold required for the job, and had the ring repaired in full view of the local populace. In Plutarch’s Essay, he speaks of the ‘impertinent labor of the goldsmith.’ In the Menaechmi, a comedy by Plautus (died 184 B.C), one of the women asks that her bracelet be taken to the goldsmith’s, that an ounce of gold be added to it, and that it be fashioned anew. Today, the wealthy Hindu, to protect himself, follows the procedure of Piso, for in India, likewise, the goldsmith is held in little esteem.
Theophrastus, writing about 315 B.C, mentions those stones which are cut as gems, some being so hard they cannot be cut with iron ‘but only by other stones’. Some sort of a lathe was even the used by lapidaries, as certain of the gems of that time have been shaped by the turner’s instruments. The carbuncle, emerald, and other stones, notably the stone from the ‘gold mines of Lampsacus used as a seal by the King’ (of Persia) were engraved as signets. Cutting the lapis lyncurius (tourmaline?) was difficult and workmanship was needed to bring out the luster of the emerald ‘for originally it is not so bright.’
Roman Jewelers And Lapidaries (continued)
Tuesday, October 30, 2007
Descartes Error
Good Books: The book "Descartes Error" by A. Damasio investigates people who have suffered serious brain injuries and found that people who do not perceive emotions correctly will act irrationally. According to Damasio, emotion is necessary for rational behavior. Emotions allow you to choose quickly and easily among the many choices constantly available to you, saving you time and allowing you to zero in on correct solutions to problems.
A real gem. I enjoyed it.
A real gem. I enjoyed it.
Vinod Khosla
Vinod Khosla is considered by many one of the most successful entrepreneur + investor in renewable energy, microfinance, and the environment. Specific investment themes include:
1) Cellulosic - Mascoma, Celunol, Range Fuels, 1 stealth startup
2) Future Fuels - LS9, Gevo, Amyris Biotechnologies, Coskata Energy
3) Efficiency - Transonic Combustion, GroupIV Semiconductor, 1 stealth startup
4) Homes - Living Homes, Global Homes
5) Natural Gas - Great Point Energy
6) Solar - Stion, Ausra
7) Tools - Nanostellar, Codon Devices, Praj
8) Water - 2 stealth startup
9) Plastic - Segetis, 1 stealth startup
10) Corn/Sugar Fuels - Altra, Cilion, Hawaii Bio
Useful links:
Vinod Khosla, Khosla Ventures
www.khoslaventures.com
1) Cellulosic - Mascoma, Celunol, Range Fuels, 1 stealth startup
2) Future Fuels - LS9, Gevo, Amyris Biotechnologies, Coskata Energy
3) Efficiency - Transonic Combustion, GroupIV Semiconductor, 1 stealth startup
4) Homes - Living Homes, Global Homes
5) Natural Gas - Great Point Energy
6) Solar - Stion, Ausra
7) Tools - Nanostellar, Codon Devices, Praj
8) Water - 2 stealth startup
9) Plastic - Segetis, 1 stealth startup
10) Corn/Sugar Fuels - Altra, Cilion, Hawaii Bio
Useful links:
Vinod Khosla, Khosla Ventures
www.khoslaventures.com
Inside Burma
It has been reported that there are many Westerners of all colors and disguises inside Burma buying rubies, sapphires, jade and other colored stones of all qualities despite the hue and cry of banning Burmese colored gemstones. It's an addiction + no matter what the trade associations, politicians, bureaucrats and human rights activists try to do behind the scene discreet dealers will flock to Burma one way or the other. I think you need someone like Edward Zwick, the director and producer of the film Blood Diamond, to tell world in a dramatic way. I think he did a good job by producing the movie to highlight the plight of poor Sierra Leoneans. Blood Ruby would be a perfect title.
Raja Ravi Varma
(via BBC) It has been reported that the painting of the Maharaja of Travancore and his younger brother welcoming Richard Temple-Grenville, governor-general of Madras, on an official visit to what is now the southern state of Kerala in 1880, was bought by Neville Tuli, who correspondents say represents one of the top art dealers in Mumbai (Bombay). The painting by Indian artist Raja Ravi Varma in 1880 was sold for £602,400 ($1.24m). It was sold by the London auctioneer, Bonhams, on Friday for a price which dwarfed the estimated sale price of £50,000-70,000. Raja Ravi Varma (1848-1906) was one of the most admired academic painters of colonial India, and was often invited to state occasions by British and Indian high officials.
I think there are many rich Indians who are investing in paintings, especially if it has an Indian link. Good news for the auctions houses and art dealers.
I think there are many rich Indians who are investing in paintings, especially if it has an Indian link. Good news for the auctions houses and art dealers.
The Most Wanted Works Of Art
Kelly Devine Thomas writes about collector's habits + wish lists of museum curators + eternally hot art works by the greats + most wanted art works + other viewpoints @ http://artnews.com/issues/article.asp?art_id=1417
Green Your Business
(via FastCompany) Mark Borden, Jeff Chu, Charles Fishman, Michael A. Prospero, and Danielle Sacks writes about greening business with smart ideas @ Slideshow: 50 Ways to Green Your Business
Useful link:
http://www.fastcompany.com/multimedia/slideshows/content/50-ways-to-green_pagen_2.html
Useful link:
http://www.fastcompany.com/multimedia/slideshows/content/50-ways-to-green_pagen_2.html
Diamonds Are A Girl's Best Friend
(via YouTube) Diamonds are a girl's best friend @ http://www.youtube.com/watch?v=OhQ8ltHZwu8
The Carat
(via The History and Use of Diamond:1962) S Tolansky writes:
In the Middle Ages and the period of the Renaissance the jewel which was really extensively worn, naturally enough by ladies, was not the diamond but the pearl. Pearls have been taken from the Persian Gulf since the days of the Macedonians, if not earlier, and from the time of the Ptolemies pearl fishing has been actively conducted in the Red Sea. It is well-known that certain freshwater mussels can produce excellent river pearls and this, too, has been a source of pearls since ancient times. The river pearls of Britain are even mentioned by Tacitus and by Pliny, and a breast-plate studded with British river pearls was dedicated by Julius Ceasar to Venus Genetrix. It is perhaps worthy of mention that in 1355 Scottish river pearls are referred to in a legal statute, and that in the time of Charles II the Scottish river pearl trade was on a scale big enough to justify a Parliamentary discussion.
However, it was essentially the pearls of the Orient which really flooded Europe and they were certainly used in great profusion by the great ladies at the courts. Pearl collars, pearl hair decorations and pearl girdles are seen very frequently in contemporary portraits. This use of pearls mounted to a climax at the time of Queen Elizabeth I. The well-known portraits of this Queen, now in the National Portrait Gallery, London, show her to be wearing thousands of pearls. In one painting an enormous pearl rope of several turns contained perhaps a thousand pearls, and the whole grand dress is simply covered with this gem. The weight must have been considerable.
Now it was from this extensive pearl trade of the Orient that the weight measure still used today for all gems, diamond included, arose originally. In early times, the smallest units of weight adopted in commerce were, generally, specified seeds. For example, the barley grain was the lowest weight unit in this country and there are still, by definition 7000 grains to the pound weight. Of course, such a weight is an average. The astute ancient pearl dealers of the Orient made the very striking discovery that the dry seeds of the fruit of the locust-pod tree are remarkably uniform in weight. This tree is very widespread over the Mediterranean and in the whole Near and Far East. The locust-pd tree produces a curved fruit, something resembling a flattened, hard banana in appearance, rather like a horn. The pearl traders noticed that no matter how old the tree, and no matter which part of the pod the seeds came from, the weights of the dry seeds were remarkably uniform. This seed being readily available, it was adopted by the pearl dealers as the unit of weight for measuring pearls. The old Greek name for the plant is Keration, from whence we derive the word carat. The carat was originally the weight of the seed of this locust-pod fruit.
That the seeds have an amazing uniformity in weight can be demonstrated today with precision balances. The small differences found, say less than 1/1000th part of an ounce, are too small to have been measurable by the simple balances available to the ancient traders. As far as they could measure, such seeds were absolutely identical, and this fact is a remarkable tribute to the astuteness of the ancient pearl traders.
For many centuries the adopted working carat was a little different in weight in different parts of Europe, but always more or less the same, i.e something near to a fifth part of a gram, or 1/140th part of an ounce. Strangely enough, although the carat has been in use in this country since Norman times at least, it was for long only an agreed measure of commerce and had no legal standing at all. Even up to the middle of the nineteenth century the persistent differences in different trading centers were still appreciable. The weight in milligrams of the carat was 197 in Florence, 205 in Berlin, 206 in Vienna, 207 in Madras. The values used actually ranged from 188 to 213 milligrams, a variation of some thirteen percent. This was too much to be tolerated for reliable international Committee on Weights and Measures in Paris proporsed the adoption of what is now called the metric carat, which was to be exactly 200 milligrams, i.e 1/5th of a gram, or 1/142nd of an ounce. The French Government sought international agreement, but this very sensible proposal was resisted by many jewelers. However, pressure was exerted, and in 1915 the Board of Trade in this country at last legalized the metric carat. This was carried out more or less simultaneously in Britain, Holland, Belgium and the U.S.A, the four countries in which the dealing in diamonds was mainly concentrated. Strangely enough, South Africa, a principal source of diamonds, only adopted the metric carat as late as 1923. It is now universally used for gemstones and this fact must be remembered when the weights of old historical diamonds are being discussed.
The carat is quite a small measure, yet so costly is the diamond that the carat is subdivided still further, especially in the United States, where it is divided into one hundred points. Thus a stone weighing one and a quarter carats is written 1.25 carats and this particular diamond would be described as being of weight one carat and twenty five points. The carat is still retained as of old for the pearl, though in this trade a coarser sub-division is usual, the pearl grain, which is a quarter of a carat.
It is not easy to visualize carat sizes, but the following will help. A natural octahedron of height about 1/10th of an inch could weigh 1/10th of a carat. An octahedron of height one quarter of an inch could weigh about 1 carat. For an octahedron of height half an inch, the weight might be 8 carats. The polished gem of the shape called the brilliant grades differently because of the material lost in shaping. A brilliant 1/10th of an inch across weights about 1/16th of a carat, while a 1 carat brilliant-cut gem has a diameter of about one quarter of an inch. A brilliant gem of diameter half an inch would weigh about 8 carats. It will be seen that a 1 carat gem is a sizeable stone, hence the need for the division into points when estimating prices, especially of the finished products. Since a good quality 1 carat, finished, brilliant shaped diamond can cost currently some $1600 (?) in the U.S.A that very small additional quantity of weight which is called the point, although no more than a mere 10 milligrams, i.e just about 1/14000th part of an ounce, is worth as much as $16 (?). It is not surprising that finished brilliants are very carefully weighed to 1/100th part of a carat nowadays by jewelers when valuation takes place.
As a reminder, attention is drawn to the unfortunate use of the word carat in this country to denote the fineness of gold. Pure gold is classed as 24 carat gold, and alloys are graded accordingly. For instance, 18 carat gold means that the alloy contains 18/24ths of pure gold, i.e. 75 percent American, and continental practice favors a different spelling for the gold carat, replacing the c by k to read karat. This is an admirable suggestion and we would be well advised to adopt this practice here to avoid confusion with the carat which internationally accpeted now as a gem weight and should have nothing to do with the alloy/gold content.
In the Middle Ages and the period of the Renaissance the jewel which was really extensively worn, naturally enough by ladies, was not the diamond but the pearl. Pearls have been taken from the Persian Gulf since the days of the Macedonians, if not earlier, and from the time of the Ptolemies pearl fishing has been actively conducted in the Red Sea. It is well-known that certain freshwater mussels can produce excellent river pearls and this, too, has been a source of pearls since ancient times. The river pearls of Britain are even mentioned by Tacitus and by Pliny, and a breast-plate studded with British river pearls was dedicated by Julius Ceasar to Venus Genetrix. It is perhaps worthy of mention that in 1355 Scottish river pearls are referred to in a legal statute, and that in the time of Charles II the Scottish river pearl trade was on a scale big enough to justify a Parliamentary discussion.
However, it was essentially the pearls of the Orient which really flooded Europe and they were certainly used in great profusion by the great ladies at the courts. Pearl collars, pearl hair decorations and pearl girdles are seen very frequently in contemporary portraits. This use of pearls mounted to a climax at the time of Queen Elizabeth I. The well-known portraits of this Queen, now in the National Portrait Gallery, London, show her to be wearing thousands of pearls. In one painting an enormous pearl rope of several turns contained perhaps a thousand pearls, and the whole grand dress is simply covered with this gem. The weight must have been considerable.
Now it was from this extensive pearl trade of the Orient that the weight measure still used today for all gems, diamond included, arose originally. In early times, the smallest units of weight adopted in commerce were, generally, specified seeds. For example, the barley grain was the lowest weight unit in this country and there are still, by definition 7000 grains to the pound weight. Of course, such a weight is an average. The astute ancient pearl dealers of the Orient made the very striking discovery that the dry seeds of the fruit of the locust-pod tree are remarkably uniform in weight. This tree is very widespread over the Mediterranean and in the whole Near and Far East. The locust-pd tree produces a curved fruit, something resembling a flattened, hard banana in appearance, rather like a horn. The pearl traders noticed that no matter how old the tree, and no matter which part of the pod the seeds came from, the weights of the dry seeds were remarkably uniform. This seed being readily available, it was adopted by the pearl dealers as the unit of weight for measuring pearls. The old Greek name for the plant is Keration, from whence we derive the word carat. The carat was originally the weight of the seed of this locust-pod fruit.
That the seeds have an amazing uniformity in weight can be demonstrated today with precision balances. The small differences found, say less than 1/1000th part of an ounce, are too small to have been measurable by the simple balances available to the ancient traders. As far as they could measure, such seeds were absolutely identical, and this fact is a remarkable tribute to the astuteness of the ancient pearl traders.
For many centuries the adopted working carat was a little different in weight in different parts of Europe, but always more or less the same, i.e something near to a fifth part of a gram, or 1/140th part of an ounce. Strangely enough, although the carat has been in use in this country since Norman times at least, it was for long only an agreed measure of commerce and had no legal standing at all. Even up to the middle of the nineteenth century the persistent differences in different trading centers were still appreciable. The weight in milligrams of the carat was 197 in Florence, 205 in Berlin, 206 in Vienna, 207 in Madras. The values used actually ranged from 188 to 213 milligrams, a variation of some thirteen percent. This was too much to be tolerated for reliable international Committee on Weights and Measures in Paris proporsed the adoption of what is now called the metric carat, which was to be exactly 200 milligrams, i.e 1/5th of a gram, or 1/142nd of an ounce. The French Government sought international agreement, but this very sensible proposal was resisted by many jewelers. However, pressure was exerted, and in 1915 the Board of Trade in this country at last legalized the metric carat. This was carried out more or less simultaneously in Britain, Holland, Belgium and the U.S.A, the four countries in which the dealing in diamonds was mainly concentrated. Strangely enough, South Africa, a principal source of diamonds, only adopted the metric carat as late as 1923. It is now universally used for gemstones and this fact must be remembered when the weights of old historical diamonds are being discussed.
The carat is quite a small measure, yet so costly is the diamond that the carat is subdivided still further, especially in the United States, where it is divided into one hundred points. Thus a stone weighing one and a quarter carats is written 1.25 carats and this particular diamond would be described as being of weight one carat and twenty five points. The carat is still retained as of old for the pearl, though in this trade a coarser sub-division is usual, the pearl grain, which is a quarter of a carat.
It is not easy to visualize carat sizes, but the following will help. A natural octahedron of height about 1/10th of an inch could weigh 1/10th of a carat. An octahedron of height one quarter of an inch could weigh about 1 carat. For an octahedron of height half an inch, the weight might be 8 carats. The polished gem of the shape called the brilliant grades differently because of the material lost in shaping. A brilliant 1/10th of an inch across weights about 1/16th of a carat, while a 1 carat brilliant-cut gem has a diameter of about one quarter of an inch. A brilliant gem of diameter half an inch would weigh about 8 carats. It will be seen that a 1 carat gem is a sizeable stone, hence the need for the division into points when estimating prices, especially of the finished products. Since a good quality 1 carat, finished, brilliant shaped diamond can cost currently some $1600 (?) in the U.S.A that very small additional quantity of weight which is called the point, although no more than a mere 10 milligrams, i.e just about 1/14000th part of an ounce, is worth as much as $16 (?). It is not surprising that finished brilliants are very carefully weighed to 1/100th part of a carat nowadays by jewelers when valuation takes place.
As a reminder, attention is drawn to the unfortunate use of the word carat in this country to denote the fineness of gold. Pure gold is classed as 24 carat gold, and alloys are graded accordingly. For instance, 18 carat gold means that the alloy contains 18/24ths of pure gold, i.e. 75 percent American, and continental practice favors a different spelling for the gold carat, replacing the c by k to read karat. This is an admirable suggestion and we would be well advised to adopt this practice here to avoid confusion with the carat which internationally accpeted now as a gem weight and should have nothing to do with the alloy/gold content.
Monday, October 29, 2007
Last Supper Gets 16bn Pixel Boost
(via BBC) A 16 billion pixel image of Leonardo da Vinci's Last Supper has been posted on the internet, allowing art lovers close up details of the 15th Century work.
Useful link:
http://news.bbc.co.uk/2/hi/europe/7065903.stm
Useful link:
http://news.bbc.co.uk/2/hi/europe/7065903.stm
Varnedoe’s Vision
Robert Storr writes about Kirk Varnedoe + his significant contributions to the art world + his legacy + other viewpoints @ http://artnews.com/issues/article.asp?art_id=1416
Edward Norton
(via You Tube) Edward Norton - "My Baby Just Cares for Me"
http://www.youtube.com/watch?v=cxd_TlVn0e8
A real gem. I enjoyed it. Watch it.
http://www.youtube.com/watch?v=cxd_TlVn0e8
A real gem. I enjoyed it. Watch it.
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