New Record Size for CVD Laboratory-Grown Diamond
The New York laboratory reports on a new record size for CVD laboratory-grown diamond.
Acicular Troughs Coincident with Green Stains on Rough Diamond Surface
The author acquired an alluvial rough diamond from Guyana showing unique surficial features that do not appear to have been documented elsewhere.
Complex Fluid Inclusion in Topaz
A blue topaz recently examined by the authors contained an interesting and complex fluid-filled negative crystal that revealed some remarkable behavior when cooled down.
Extraterrestrial-Like Inclusion in Mozambique Ruby
Microscopic examination reveals an inclusion resembling an extraterrestrial in a ruby from Mozambique.
Rare Blue Apatite Inclusion in Smoky Quartz
A very light blue hexagonal apatite inclusion is observed in natural smoky quartz.
YAG with Flux-Filled Fingerprints
The author recently examined a 3.58 ct yellowish green yttrium aluminum garnet, a manufactured product known in the trade as “YAG,” that contained numerous large flux-filled fractures.
Mercury Free Mining Pilot Program
Skull Carved of Meteorite
Four-billion-year-old meteorite carved into a life-sized human skull draws attention at the 2022 AGTA show.
Stephen M. Avery: Celebrating Half a Century in Gem Cutting
Approaching his 50th anniversary in the business, Stephen M. Avery (Lakewood, Colorado) reflected on his journey to becoming an award-winning lapidary artist, detailing his signature cuts and gem sets and offering advice to up-and-coming gemstone cutters.
Market Reaction to the Pandemic: Insights from Exhibitors
A survey of Tucson exhibitors investigates the COVID-19 pandemic’s impact on business and market trends.
Large Green and Yellow Diamonds Colored by Nickel Impurities
Testing several large green and yellow diamond samples reveals that nickel-colored diamonds can occur in larger sizes and stronger color saturations than previously suspected.
The Type IIb De Beers Cullinan Blue Diamond
GIA’s New York laboratory reports on a 15.10 ct (17.47 × 11.53 × 7.94 mm) Fancy Vivid blue cut-cornered rectangular step cut named the De Beers Cullinan Blue diamond.
GIA 通过 GIA Source Verify™ 拓展宝石原产地服务
作为宝石学研究、教育以及以科学为基础的宝石鉴定与分级服务方面的领导者，GIA 目前正在积极拓展宝石原产地服务，致力于向零售商和消费者提供所需的钻石产地信息。
GIA 在第五届年度大赛上表彰设计新秀
加利福尼亚州卡尔斯巴德— 2 月 14 日（星期一）— 2 月 4 日，来自 GIA 卡尔斯巴德校区的 GIA 毕业生 Meghan Simmons（梅根·西蒙斯）荣获第五届 Gianmaria Buccellati Foundation Award for Excellence in Jewelry Design（吉安马里亚·布契拉提基金会珠宝设计卓越奖）。
Blue Sapphires from Mogok, Myanmar: A Gemological Review
A gemological analysis of blue Burmese sapphires from Mogok, based on a series of field expeditions over the last decade.
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