Research Article Search Results
Red Cordierite from Madagascar (英語)
The gemological properties of the first documented occurrence of red cordierite, from Madagascar, are examined.
Large Colorless HPHT Synthetic Gem Diamonds from China (英語)
A report on the HPHT growth of large, gem-quality colorless synthetic diamonds in China
Paula Crevoshay’s American Collection, Plus Jewelry with Nontraditional Gemstones (英語)
Lesser-known gem materials are seen in pieces alongside a collection created as an artistic inheritance for future generations of jewelry fans.
Analysis of Yellow Diamond Melee for Color Treatment and Synthetics (英語)
A parcel revealed to contain natural, treated, and synthetic diamonds reinforces the importance of identification.
Largest Blue HPHT Synthetic Diamond (英語)
Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.
Ring with a CVD Synthetic Melee Diamond (英語)
A round-cut specimen set in a ring is the first mounted CVD synthetic melee diamond identified by GIA.
マダガスカル、アンドラノンダンボ近郊の新しい鉱床から産出されたブルーサファイア (英語)
A recent rush in Madagascar yields new sapphire production.
Splendor in the Outback（奥地の輝き）：オーストラリアのオパール産地への訪問 (英語)
Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.
Graphite Inclusions Forming Octahedral Outline in Diamond (英語)
An inclusion outlined by minute graphite crystals within a diamond create an octahedral shape.
Two Large CVD-Grown Synthetic Diamonds Tested by GIA (英語)
Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.
Rubies from a New Deposit in Zahamena National Park, Madagascar (英語)
A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.
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