Plastic Amber Imitation in a Rosary
An Inside Look at the 2017 Tucson Shows
An overview of the trends reported at the 2017 Tucson gem shows.
Causes of Iridescence inNatural Quartz
Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.
Brazilian Diamonds: A Historical and Recent Perspective
Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.
The Role of Silicon in the Color of Gem Corundum
Considers the previously unreported but critical impact of silicon on the coloration of gem-quality sapphire.
Japanese Jadeite: History, Characteristics, and Comparison with Other Sources
Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.
GIA发现覆合钻石
Analysis of a diamond graded Fancy blue revealed a CVD synthetic overgrowth on natural diamond.
针对产自 Baw Mar 矿(缅甸摩谷)的蓝色蓝宝石的深入宝石学研究
GIA 实地宝石学家在 2013 年、2014 年和 2015 年考察过 Baw Mar 的运营。 在本次研究中,我们分析了在两个独立考察期间收集的样本。
Atypical “Beading” in the Production of Cultured Pearls from Australian Pinctada maxima
In 2011, the authors began to see cases of low-quality natural pearls being used as unconventional “beads” for cultured nacre growth.
“嬉皮”设计师兼估价师追随本心,重新点燃当地校友分会的激情
研究宝石学家 Rebecca Buys(丽贝卡·拜斯)是设计师兼估价师,拥有充实的事业历程,为加利福尼亚州圣地亚哥的 GIA 校友指点机遇。
Cuprian Liddicoatite Tourmaline
Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.

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