An HPHT-treated round brilliant diamond with an inscription that presents as a GIA report number is found to be inconsistent with the institute's report, previously issued for an untreated diamond.

A report on turquoise from the only known U.S. deposit outside of the Southwest.

A selection of very small akoya cultured specimens demonstrates the challenges gemologists face when determining pearl origin.

A new report from GIA's Bangkok laboratory examines a set of 120 NBC samples stated to be of "Tahitian" origin.

A new report from GIA's Bangkok laboratory examines a set of 120 NBC samples stated to be of "Tahitian" origin.

珠宝商 M.D. Hohenstine 令人惊艳的橱窗陈列是俄亥俄州哥伦比亚市中心一项备受欢迎的传统，拥有 50 多年的历史。

A renewed structure, expanded education opportunities and other tools will help GIA Alumni Association chapters and members communicate GIA connection.

‘Adventure seeker’ crawls through underground caves to reach and research giant selenite crystals – then shares her knowledge with the world.

A jeweler who quietly built a circle of inspiration and influence lives on in generations of GIA-educated jewelers and gemologists.

在世界各地买家变得更加谨慎的情况下，创纪录的大型彩色钻石和大型无色钻石的数量并没有以前那么可观。

GIA 研究人员分析并确认，戴比尔斯的 Lightbox 钻石是使用化学蒸气沉淀法培育而成。

晶簇首饰近年来大受欢迎。名人们戴着它在红毯上争奇斗艳，设计师们在宝石展上为之如痴如狂。

如果阿盖尔矿生产的其他宝石价格不提高，阿盖尔粉红色彩色钻石的供应可能会在 2020 年中断。另附：更多钻石的最新信息。

GIA serves alumni by continuing to share knowledge, develop and deliver education, and provide opportunity for our alumni throughout their careers.

Charles（查尔斯）和 Erna Leutwyler（厄纳·路特威勒）捐赠的奖学金，使得在宝石和珠宝专业颇具抱负的后代们能够追逐自己的梦想。

Natural diamonds exhibit characteristics normally seen in synthetic material.

Unusual inclusions are found in an opal from Ethiopia’s Wollo Province.

Opal purportedly from a new deposit is found to be dyed.