What is Chameleon diamond?
Sometimes colored gemstones tend to show certain phenomenal effects when properly cut. Well informed buyers are familiar with the phenomenal effects in corundum (stars), chrysoberyl (cat's eye), alexandrite (color change), opal (play of color), sunstone (aventurescence), labradorite (labradorescence), moonstone (schiller) and aventurine quartz (aventurescence). The optical effects are due to inclusions, reflection, twinning, selective absorption or diffraction.
But there is an unusual phenomenon in diamond known in the trade as ‘chameleons’. In nature, chameleons are large lizards that are well-known for their ability to change their body color, a unique physical and physiological condition due to their mood, light and temperature, where the skin color plays an important role in adapting to the surroundings, communication among the species or rivalry fights. You may see a similar chameleon-like phenomenon in natural green diamond. The suitable natural green (grayish yellow green) diamonds react to heat and change color temporarily, becoming yellow (greenish orangish yellow), and then reverts to its stable color. When you have a large stone with the unique phenomenon, the color shift becomes easier to perceive and describe, especially if you have a comparison stone. Chameleon-like diamonds are perceived to be one of the great mysteries of the diamond world. There are various
interpretations by gem experts on the cause and effect, and most specimens are sold with lab reports. Overall it is still not known as to why these diamonds change from deep green to yellow when heated or left in darkness.
The chameleon-like diamonds are rare, and not well understood by the public, dealers and jewelers due to lack of awareness or education. One has to wonder how many chameleon-like diamonds may have slipped through a dealer’s hand due to lack of knowledge. How many jewelers have ever seen a chameleon-like diamond? Very few. Collectors who are familiar with the chameleon-like effect in diamonds often pay high premiums for large stones at international auctions. Because of its celebrity status and stunning look, imaginative designers have recognized the potential by designing chameleon-like diamonds in one-of-a-kind jewelry to create a masterpiece.
Australia’s Argyle diamond mine, famous for its fancy color diamonds also produces chameleon-like diamonds. The stones are recognized by their blue violet gray or gray yellow green color. One interpretation by the experts is that the color may be due to high hydrogen content. Experiments have been conducted in the laboratory by heating and observation to study its unusual properties. The catch-22 is heating an enhanced diamond may result in permanent modification of color. Sophisticated analytical techniques with proper skills in interpreting the test results may be required to separate chameleon-like diamonds from another type of green diamond. If in doubt always consult a reputed gem testing laboratory.
Monday, February 12, 2007
A Miner Finds 143 carat Diamond In Congo
It has been reported that Amos Maseko, a poor miner has found 143 carat diamond in a river near Banalia, 129 km north of Kisangani, in The Democratic Republic of Congo, and sold it for US$1.4 million.
Kisangani is a popular source for alluvial diamonds, where one to three carat size diamonds are usually found. Most of Congo’s diamond reserves are located in the Kasai provinces over 600 km south west of Kisangani. In addition to diamonds, The Democratic Republic of Congo is also known to have ample reserves of gold, silver copper and cobalt.
Kisangani is a popular source for alluvial diamonds, where one to three carat size diamonds are usually found. Most of Congo’s diamond reserves are located in the Kasai provinces over 600 km south west of Kisangani. In addition to diamonds, The Democratic Republic of Congo is also known to have ample reserves of gold, silver copper and cobalt.
The Federal Trade Commission’s Guide for the Jewelry, Precious Metals and Pewter Industries
FTC writes:
23.18 Definitions of various pearls.
As used in these guides, the terms set forth below have the following meanings:
(a) Pearl: A calcareous concretion consisting essentially of alternating concentric layers of carbonate of lime and organic material formed within the body of certain mollusks, the result of an abnormal secretory process caused by an irritation of the mantle of the mollusk following the intrusion of some foreign body inside the shell of the mollusk, or due to some abnormal physiological condition in the mollusk, neither of which has in any way been caused or induced by humans.
(b) Cultured Pearl: The composite product created when a nucleus (usually a sphere of calcareous mollusk shell) planted by humans inside the shell or in the mantle of a mollusk is coated with nacre by the mollusk.
(c) Imitation Pearl: A manufactured product composed of any material or materials that simulate in appearance a pearl or cultured pearl.
(d) Seed Pearl: A small pearl, as defined in (a), that measures approximately two millimeters or less.
More info @ http://www.ftc.gov/bcp/guides/jewel-gd.htm
23.18 Definitions of various pearls.
As used in these guides, the terms set forth below have the following meanings:
(a) Pearl: A calcareous concretion consisting essentially of alternating concentric layers of carbonate of lime and organic material formed within the body of certain mollusks, the result of an abnormal secretory process caused by an irritation of the mantle of the mollusk following the intrusion of some foreign body inside the shell of the mollusk, or due to some abnormal physiological condition in the mollusk, neither of which has in any way been caused or induced by humans.
(b) Cultured Pearl: The composite product created when a nucleus (usually a sphere of calcareous mollusk shell) planted by humans inside the shell or in the mantle of a mollusk is coated with nacre by the mollusk.
(c) Imitation Pearl: A manufactured product composed of any material or materials that simulate in appearance a pearl or cultured pearl.
(d) Seed Pearl: A small pearl, as defined in (a), that measures approximately two millimeters or less.
More info @ http://www.ftc.gov/bcp/guides/jewel-gd.htm
The Color Handbook
By E P Danger
Gower Technical Press
1987 ISBN 0-291-39717-4
Gower Technical Press writes:
In commercial situations, choice of color should never be simply a matter of preference. Choosing the right colors for the right applications directly affects performance in the marketplace. Color can also influence productivity.
The Color Handbook is a permanent and unique handbook for all those concerned with the marketing, selling and productivity aspects of color. There is no other source of reference which covers the same breadth of field, or which contains so much invaluable information in such a succinct form.
Author Eric P Danger draws on the experience and knowledge gained over nearly 30 years as a leading Color Research consultant. Here, in readily accessible terms, he explains the many attributes and characteristics of color, and its importance in the marketplace and the work environment. It is essential reading for those seeking a practical basis for choosing colors which will help achieve maximum sales and provide the best possible conditions in the workplace.
The Color Handbook includes a guide to color principles, color selection techniques, color usage and color trends as they apply to consumer and industrial products, graphical applications, productive and selling environments. A particularly useful section is the comprehensive Color Index, subdivided by hue and analyzed under nearly 100 different headings.
Managers who are responsible for the selection of color in selling applications will find this book extremely useful. It is also intended to help those who are concerned with choice of color as it relates to the likes and dislikes of customers and clients. Advertising agents, architects, designers, interior decorators and decorating contractors and retailers will all find much that is of value to their business within these pages.
It aims to supply answers to the questions that arise in the course of everyday work involving color, giving the user the knowledge and confidence to make the right decisions.
About the author
Eric P Danger has been an independent color research consultant since 1975. He has written numerous reports and articles for the trade and technical press on various aspects of color and marketing. He is also the author of two further titles in this field, Selecting Color for Print and Selecting Color for Packaging.
Gower Technical Press
1987 ISBN 0-291-39717-4
Gower Technical Press writes:
In commercial situations, choice of color should never be simply a matter of preference. Choosing the right colors for the right applications directly affects performance in the marketplace. Color can also influence productivity.
The Color Handbook is a permanent and unique handbook for all those concerned with the marketing, selling and productivity aspects of color. There is no other source of reference which covers the same breadth of field, or which contains so much invaluable information in such a succinct form.
Author Eric P Danger draws on the experience and knowledge gained over nearly 30 years as a leading Color Research consultant. Here, in readily accessible terms, he explains the many attributes and characteristics of color, and its importance in the marketplace and the work environment. It is essential reading for those seeking a practical basis for choosing colors which will help achieve maximum sales and provide the best possible conditions in the workplace.
The Color Handbook includes a guide to color principles, color selection techniques, color usage and color trends as they apply to consumer and industrial products, graphical applications, productive and selling environments. A particularly useful section is the comprehensive Color Index, subdivided by hue and analyzed under nearly 100 different headings.
Managers who are responsible for the selection of color in selling applications will find this book extremely useful. It is also intended to help those who are concerned with choice of color as it relates to the likes and dislikes of customers and clients. Advertising agents, architects, designers, interior decorators and decorating contractors and retailers will all find much that is of value to their business within these pages.
It aims to supply answers to the questions that arise in the course of everyday work involving color, giving the user the knowledge and confidence to make the right decisions.
About the author
Eric P Danger has been an independent color research consultant since 1975. He has written numerous reports and articles for the trade and technical press on various aspects of color and marketing. He is also the author of two further titles in this field, Selecting Color for Print and Selecting Color for Packaging.
Sunday, February 11, 2007
Argyle Pink Diamond Tender
The diamonds selected for the annual Argyle Pink Diamond Tender are one-of-a-kind lot and are extremely rare. In 2006, out of 30 millions +/- carats produced by the Argyle mine only 65 stones met the Tender standards. The Tender collection included 65 natural pink and blue diamonds weighing approximately 61.43 carats. The diamonds are processed by skilled diamond cutters at the Argyle’s polishing factory in Perth.
Once a year, Argyle’s diamond marketing team issue special release on pink diamonds that are sold by special bids by invitation only. Argyle has sold pink diamonds for up to $1 million a carat. The Argyle pink diamond color ranges from various shades of pink to intense purplish red. The value is based on the intensity of color. The top quality stones are faceted into round, marquise, oval, or pear to improve the over all life and natural beauty. Demand for Argyle’s fancy pink diamonds are extremely high and collectors from around the world pay hefty premiums to buy them.
Once a year, Argyle’s diamond marketing team issue special release on pink diamonds that are sold by special bids by invitation only. Argyle has sold pink diamonds for up to $1 million a carat. The Argyle pink diamond color ranges from various shades of pink to intense purplish red. The value is based on the intensity of color. The top quality stones are faceted into round, marquise, oval, or pear to improve the over all life and natural beauty. Demand for Argyle’s fancy pink diamonds are extremely high and collectors from around the world pay hefty premiums to buy them.
The GodFather Movie
Memorable quote (s) from the movie:
Don Corleone (Marlon Brando): I never wanted this for you. I work my whole life - I don't apologize - to take care of my family, and I refused to be a fool, dancing on the string held by all those bigshots. I don't apologize - that's my life - but I thought that, that when it was your time, that you would be the one to hold the string. Senator Corleone; Governor Corleone. Well, it wasn't enough time, Michael. It wasn't enough time.
Michael (Al Pacino): We'll get there, pop. We'll get there.
Don Corleone (Marlon Brando): I never wanted this for you. I work my whole life - I don't apologize - to take care of my family, and I refused to be a fool, dancing on the string held by all those bigshots. I don't apologize - that's my life - but I thought that, that when it was your time, that you would be the one to hold the string. Senator Corleone; Governor Corleone. Well, it wasn't enough time, Michael. It wasn't enough time.
Michael (Al Pacino): We'll get there, pop. We'll get there.
The Federal Trade Commission’s Guide for the Jewelry, Precious Metals and Pewter Industries
FTC writes:
23.17 Misrepresentation of weight and "total weight."
(a) It is unfair or deceptive to misrepresent the weight of a diamond.
(b) It is unfair or deceptive to use the word "point" or any abbreviation in any representation, advertising, marking, or labeling to describe the weight of a diamond, unless the weight is also stated as decimal parts of a carat (e.g., 25 points or .25 carat).
Note 1 to paragraph (b): A carat is a standard unit of weight for a diamond and is equivalent to 200 milligrams (1/5 gram). A point is one one hundredth (1/100) of a carat.
(c) If diamond weight is stated as decimal parts of a carat (e.g., .47 carat), the stated figure should be accurate to the last decimal place. If diamond weight is stated to only one decimal place (e.g., .5 carat), the stated figure should be accurate to the second decimal place (e.g., ".5 carat" could represent a diamond weight between .495-.504).
(d) If diamond weight is stated as fractional parts of a carat, a conspicuous disclosure of the fact that the diamond weight is not exact should be made in close proximity to the fractional representation and a disclosure of a reasonable range of weight for each fraction (or the weight tolerance being used) should also be made.
Note to paragraph (d): When fractional representations of diamond weight are made, as described in paragraph d of this section, in catalogs or other printed materials, the disclosure of the fact that the actual diamond weight is within a specified range should be made conspicuously on every page where a fractional representation is made. Such disclosure may refer to a chart or other detailed explanation of the actual ranges used. For example, "Diamond weights are not exact; see chart on p.X for ranges."
More info @ http://www.ftc.gov/bcp/guides/jewel-gd.htm
23.17 Misrepresentation of weight and "total weight."
(a) It is unfair or deceptive to misrepresent the weight of a diamond.
(b) It is unfair or deceptive to use the word "point" or any abbreviation in any representation, advertising, marking, or labeling to describe the weight of a diamond, unless the weight is also stated as decimal parts of a carat (e.g., 25 points or .25 carat).
Note 1 to paragraph (b): A carat is a standard unit of weight for a diamond and is equivalent to 200 milligrams (1/5 gram). A point is one one hundredth (1/100) of a carat.
(c) If diamond weight is stated as decimal parts of a carat (e.g., .47 carat), the stated figure should be accurate to the last decimal place. If diamond weight is stated to only one decimal place (e.g., .5 carat), the stated figure should be accurate to the second decimal place (e.g., ".5 carat" could represent a diamond weight between .495-.504).
(d) If diamond weight is stated as fractional parts of a carat, a conspicuous disclosure of the fact that the diamond weight is not exact should be made in close proximity to the fractional representation and a disclosure of a reasonable range of weight for each fraction (or the weight tolerance being used) should also be made.
Note to paragraph (d): When fractional representations of diamond weight are made, as described in paragraph d of this section, in catalogs or other printed materials, the disclosure of the fact that the actual diamond weight is within a specified range should be made conspicuously on every page where a fractional representation is made. Such disclosure may refer to a chart or other detailed explanation of the actual ranges used. For example, "Diamond weights are not exact; see chart on p.X for ranges."
More info @ http://www.ftc.gov/bcp/guides/jewel-gd.htm
Principles Of Color Technology
By Fred W Billmeyer, Jr & Max Saltzman
John Wiley & Sons
1981 ISBN 0-471-03052-X
John Wiley & Sons writes:
In the fifteen years since the first edition of Principles of Color Technology, basic theory has remained the same, but in many cases practice has become considerably more automated. The second edition of this standard work covers all the major advances in color applied to the use of colorants in the industrial and creative production of colored material.
Billmeyer and Saltzman have substantially realigned their emphases in accordance with these new developments, including coverage of:
- Metamerism
- Non-color problems—quality control, techniques of sampling and sample preparation, and applications of simple statistics.
- Methods for instrument selection.
Fundamentals—the role of light, descriptions of color in objective, numerical terms, and practical industrial applications of color technology—are covered in the same methodical manner that has made Principles of Color Technology such an important information source for both industry and academics. Current updated material and a refinement of the general presentation make this second edition even more indispensable to the world of color technology.
John Wiley & Sons
1981 ISBN 0-471-03052-X
John Wiley & Sons writes:
In the fifteen years since the first edition of Principles of Color Technology, basic theory has remained the same, but in many cases practice has become considerably more automated. The second edition of this standard work covers all the major advances in color applied to the use of colorants in the industrial and creative production of colored material.
Billmeyer and Saltzman have substantially realigned their emphases in accordance with these new developments, including coverage of:
- Metamerism
- Non-color problems—quality control, techniques of sampling and sample preparation, and applications of simple statistics.
- Methods for instrument selection.
Fundamentals—the role of light, descriptions of color in objective, numerical terms, and practical industrial applications of color technology—are covered in the same methodical manner that has made Principles of Color Technology such an important information source for both industry and academics. Current updated material and a refinement of the general presentation make this second edition even more indispensable to the world of color technology.
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