关于卡拉拉大理石的加注文献清单

冠状病毒对中国大陆及香港的经济影响。以及钻石市场和黄金首饰的最新资讯。

近日，GIA 科学家展示了他们在钻石标记以及钻石灰-蓝-紫颜色成因方面的最新研究成果。

关于纳米比亚冲积钻石的加注文献清单。

In some cases, the value of a sapphire depends strongly on its geographic origin. This article details the origin data GIA has collected for blue sapphire and describes its methodology for using the data in geographic origin determination.

With more than 90 field expeditions on six continents since 2008, GIA has accumulated over 22,000 colored stone reference samples. This extensive collection of colored stones with known origins supports GIA’s research on geographic origin determination.

The world ruby market has undergone dramatic change in recent years, especially with the development of ruby mining in Mozambique. This contribution outlines GIA’s methods and criteria for establishing the geographic origin of ruby.

Over the last two decades, knowledge of the formation of gem deposits has improved significantly. This article reviews the state of our knowledge of the geology and genesis of gem corundum and emerald deposits.

The relative chemical diversity of emeralds from different deposits worldwide allows clear origin determination in most cases. This contribution explains the criteria used by GIA to make geographic origin conclusions for emeralds.

The geographic source of this rare color-change gem has a significant impact on value. Trace element chemistry profiles allow GIA to accurately determine origin for alexandrite from several countries.

James Shigley（詹姆斯·希格利）博士分享了 GIA 确定宝石原产地的方法以及钻石原产地的奥秘。