Showing posts with label James E. Shigley. Show all posts
Showing posts with label James E. Shigley. Show all posts
Sunday, December 29, 2019

Natural-Color Fancy White And Fancy Black Diamonds: Where Color And Clarity Converge

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These two colors are outliers within the colored diamond world. Gemologists must read the GIA report. Useful link: https://www.gia.edu...
Monday, September 30, 2019

Inclusions In Natural, Treated, Synthetic, And Imitation Opal

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Take a look. Useful link: https://www.gia.edu/gems-gemology/summer-2019-suggested-reading-opal-chart
Saturday, August 24, 2019

Inclusions In Natural, Treated, Synthetic, And Imitation Opal

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Take a look at a wide range of interesting inclusions in opal. Useful link: https://www.gia.edu/gems-gemology/summer-2019-suggested-rea...
Sunday, April 07, 2019

Chart: Inclusions In Natural, Synthetic, And Treated Diamond

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A good reference chart from the GIA. Useful link: https://www.gia.edu/gems-gemology/winter-2018-inclusions-natural-synthetic-treated-diam...
Thursday, February 21, 2019

Natural-Color Pink, Purple, Red, And Brown Diamonds: Band Of Many Colors

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A series of studies on natural colored diamonds. Useful link: https://www.gia.edu/gems-gemology/winter-2018-natural-color-pink-purple-red...
Monday, September 03, 2018

Natural-Color Blue, Gray, And Violet Diamonds: Allure Of The Deep

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An insightful study. Useful link: https://www.gia.edu/gems-gemology/summer-2018-natural-color-blue-gray-violet-diamonds-allure-of-the-dee...
Saturday, July 28, 2018

Natural-Color Green Diamonds: A Beautiful Conundrum

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A must read. Useful link: https://www.gia.edu/gems-gemology/spring-2018-natural-color-green-diamonds-beautiful-conundrum
Tuesday, June 12, 2018

New Plastic Imitation Opal From Kyocera

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Opal imitation update. Useful link: https://www.gia.edu/gems-gemology/spring-2018-labnotes-new-plastic-imitation-opal-from-kyocera
Tuesday, March 20, 2018

The Ultimate Gemologist: A Tribute To Richard T. Liddicoat

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Spot on. Useful link: https://www.gia.edu/gems-gemology/spring-2002-tribute-richard-liddicoat-dirlam
Thursday, March 01, 2018

Inclusions In Natural, Synthetic, And Treated Ruby

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A good comparison study. Useful link: https://www.gia.edu/gems-gemology/winter-2017-inclusions-natural-synthetic-ruby
Wednesday, December 20, 2017

Observations On HPHT-Grown Synthetic Diamonds: A Review

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Useful update. Useful link: https://www.gia.edu/gems-gemology/fall-2017-observations-hpht-grown-synthetic-diamonds
Saturday, September 30, 2017

Inclusions In Natural, Synthetic, And Treated Sapphire

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Take a look. Useful link: https://www.gia.edu/gems-gemology/summer-2017-inclusions-sapphire
Thursday, May 18, 2017

Brazilian Diamonds: A Historical And Recent Perspective

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A must read. Useful link: https://www.gia.edu/gems-gemology/spring-2017-brazilian-diamonds
Tuesday, August 09, 2016

Mining Diamonds In The Canadian Arctic: The Diavik Mine

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Take a look. Useful link: http://www.gia.edu/gems-gemology/summer-2016-diamonds-canadian-arctic-diavik-mine