Research Article Search Results
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.
Red Cordierite from Madagascar (英語)
The gemological properties of the first documented occurrence of red cordierite, from Madagascar, are examined.
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.
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.
Large Colorless HPHT-Grown Synthetic Gem Diamonds from New Diamond Technology, Russia (英語)
Examines a new source of colorless and near-colorless gem-quality HPHT synthetic diamonds using spectroscopic and gemological analysis.
Irradiated Green-Blue CVD Synthetic Diamonds (英語)
Advancing CVD growth technologies yield intensely colored, high-quality synthetic diamonds, such as the two green-blue synthetic materials seen in the New York lab.
Pezzottaite Debuts as the Newest Trapiche Gem Mineral (英語)
A rare mineral acquired along the Thai-Myanmar border exhibits the distinctive six-spoke pattern associated with trapiche.
Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation (英語)
Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.
LPHT-Annealed Pink CVD Synthetic Diamonds (英語)
The New York lab examines three pink CVD synthetic diamonds which have received LPHT annealing treatment.
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