Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...

The green turquoise cabochon, from an American mine, might become part of a designer’s unique jewelry piece. The even blue color of the cabochon on the right would be called “Persian blue” in the ...

As a consumer, you will regularly encounter in the marketplace gems that have been treated to change their appearance. A topic that often comes up is whether a particular gemstone is or isn’t treated.

Opal can range from 5 to 6.5 on the Mohs hardness scale. Hardness and toughness Gem and mineral hardness is measured on the Mohs scale. The numbers are based on the relative ease or difficulty with ...

GIA 的每门课程都是独一无二的，开始时间和课程长度、实习课所花时间、学费和其他费用都不相同。 研究宝石学家 (Graduate Gemologist ®) 取得业界最负盛名的专业证书，向全世界展示您的宝石和珠宝专业知识以及对该行业的坚定承诺。 开始日期不包括在全日制 ...

If you were born in the month of June, you are lucky enough to have three birthstones to call your own. June is one of only three months (the others are August and December) that has three birthstones ...

标记每个晶体边缘的切口被称为重入角。 有色宝石专家根据宝石所显示的颜色变化程度以及它们在不同的光线条件下所显示的红色和绿色色彩品质，来评定优良亚历山大变石。 寻找珠宝商 使用邮政编码寻找您附近有 GIA 报告和有 GIA 训练有素的工作人员的珠宝商 。

Jadeite comes in a wide range of colors. The most valuable is an intense green called Imperial. - Courtesy Mason-Kay Fine Jade Jewelry To understand the value of jade, you have to look beyond its ...

优雅的雕刻呈现此俄勒冈州日光石闪闪发光的铜内含物、浓郁的颜色和多向色性。 – Robert Weldon，由 Oregon Sunstone 友情提供 宝石行家及富有创新能力的珠宝设计师往往寻求虽然不太著名，但是不乏魅力和独特的含蓄之美的宝石。 其中包括长石族的成员。 长石族 ...

Everywhere on earth, people honor and appreciate the beauty and mystery of gems. And so it follows that everywhere you go, you also find the gem and jewelry industry. Just like the gems that are at ...

三月的两种生日石海蓝宝石和血石在外观上有着很大的差异，但在庇佑人们幸福安康这方面，二者都享有盛誉。海蓝宝石生日石让人想起大海的颜色。从深绿-蓝到淡弱绿蓝色的色彩，刻面海蓝宝石通常没有内含物，如水般清澈，象征着精神和灵魂的纯净。

The 330-ct Star of Asia is in the collection of the National Museum of Natural History – Chip Clark, courtesy Smithsonian Institution Traditionally, sapphire symbolizes nobility, truth, sincerity, and ...