图 1：含有一种称作铁方镁石深色内含物的含硼蓝色钻石，作为此项研究的一部分进行了检测。这颗宝石重 0.03 克拉。摄影：Evan M. Smith（埃文·M.·史密斯）。 这是《自然》杂志中发表的文章“来自地球下地幔的含硼蓝色钻石”的延伸摘要。GIA 高级研究员 Evan Smith ...

红宝石是刚玉矿物种别（其中还包括蓝宝石）中的一个类别。 红宝石备受珍视，每克拉单价很高。可以说，红宝石是有色宝石市场中最重要的宝石之一。 最纯的刚玉矿物是无色的。微量元素成为矿物晶体结构的一部分后，造成颜色上的差异。铬是导致红宝石 ...

莫氏硬度用以衡量宝石和矿物的硬度。 这些数值基于一种矿物可被其他物品划伤的相对难易程度得出。 但莫氏硬度会引起误导。 不同矿物的硬度等级之间的差距并不均匀。 举例来说，钻石的莫氏硬度只比刚玉高1度，但实际上它比刚玉家族的宝石坚硬好多倍。

This 5.30-carat emerald from Brazil has a slightly bluish green color. Courtesy John Parrish, courtesy African, Brazilian, Colombian Gems Incorporated. Emerald has many special qualities, but colored ...

D. Howell [[email protected]], European Journal of Mineralogy, Vol. 24, No. 4, 2012, pp. 575–585, http://dx.doi.org/10.1127/0935-1221/2012/0024-2205. Diamond ...

This jadeite "Peiyao" (Chinese Fu dog) represent mythological creatures that guard and protect celestial palaces and entrances. - Gift of Sophie Leu Jade has been cherished for thousands of years.

PDF versions of the GIA Laboratory-Grown Diamond Reports are available on Report Check. Look for an icon in the upper right hand corner. Once downloaded, the report can be printed for your records.

This study investigated the effectiveness of a handheld magnet in detecting synthetic diamonds. A total of 104 synthetic diamonds from nine different manufacturing sources were tested. Of the ...

Those born in January are lucky to have the beautiful and diverse garnet as their birthstone. Garnets are commonly red but also come in an extraordinary range of beautiful colors, including orange, ...

锂紫玉晶体与刻面锂紫玉，重量从 12.47 到 19.32 克拉不等。 - Robert Weldon（罗伯特·韦尔登） 锂紫玉可以制作成各种各样的珠宝款式，以满足每一位买家的需求。 锂紫玉富有魅力，但是消费者认知度相对较低。 然而，这也可理解为在零售环节可以获得合理价格。

Zircon comes in a wide variety of colors. Colorless zircon is well known for its brilliance and flashes of multicolored light, called fire. These two zircon properties are close enough to the ...

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 ...