An exploration of the distinction between jadeite and omphacite, plus GIA's current policy concerning the definition of these stones.

卡尔斯巴德校区的在校就读申请

纽约校区在校申请

James Sowerby（詹姆斯·索尔比）的《英国矿物学》(British Mineralogy) 及其对 Martha Proby（玛莎·普洛比）和 19 世纪科学界的影响。

Renowned teacher, master of gem identification, and developer of gemological techniques and instruments.

Mr. Naseri grew up in the lapis trade, working in his father’s business as a young boy. Born in Afghanistan, he rightfully claims a deep knowledge of this gem of his native land.

Mr. Reif came to the Tucson Gem Show to promote his mine’s product: demantoid garnet, “one of the rarest stones alive.”

在通用电气于 1971 年制成第一颗宝石级合成钻石时，公司首先将它们送到了 GIA 进行检验和研究。 44 年后的今天，GIA 研究人员密切跟踪了这些实验室培养的钻石的发展 - 从早期实验到市场的商业量化生产。

In this exclusive interview with GIA conducted at the 2013 Tucson Gem Show, Groom delivers a highly instructive tutorial on the critical nexus between gemology and business.

Bill Vance, a colored gemstone dealer from Delaware, sounds the twin notes of apprehension at the increasing worldwide scarcity of high-quality colored-stone rough, and excitement at the investment opportunity this presents for the middle-range buyer.

At age 79, Bob Halem loves reminiscing about the serendipity that brought him into the world of colored stones.

彩色钻石一直受到媒体的广泛关注。它们经常会打破拍卖行的记录。了解更多关于这些最罕见的宝石学奇迹的信息。

People have coveted natural pearls as symbols of wealth and status for thousands of years.

Perfect shining spheres. Lustrous baroque forms. Seductive strands, warm to the touch. Pearls are simply and purely organic

Peridot is the gem variety of the mineral olivine. Its chemical composition includes iron and magnesium, and iron is the cause of its attractive yellowish green colors.

Peridot has always been associated with light. In fact, the Egyptians called it the “gem of the sun.”