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

Jeff Mason provides us with a fascinating look into a sometimes-misunderstood gem and its often-unpredictable market.

List of books pertaining to the Tablet to Tablet exhibit presented by theThe Richard T. Liddicoat Gemological Library and Information Center, November 2011-August 2012, GIA, Carlsbad, California

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.

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。

红宝石是所有彩色宝石中价格最高的。优质红宝石的克拉价格持续上涨，多次打破拍卖纪录。点击此处，了解红宝石如此抢手的原因！

Learn about the factors that make tourmaline so desirable.

蓝宝石属于刚玉矿物。它的颜色可以是纯蓝色，但范围从绿蓝色到紫蓝色不等。“蓝宝石”这个名称也可以用来指代任何非红色且不属于红宝石（另一种刚玉）的刚玉。

Perhaps the best-loved gems of all time, pearls—both natural and cultured pearls—occur in a wide variety of colors. Learn about the factors that make pearls so popular and desirable!

了解珍珠的耐用性以及如何保养您的珍珠首饰

柘榴石是一组密切相关的矿物，从而使该宝石几乎拥有每一种颜色。