




GIA Gem Project Corundum
Ruby and sapphire (usually blue, but also in every other color) have been the most important colored gemstones for several thousand years. Originating historically in southeast and central Asia, and more recently in eastern Africa, these colored varieties of the mineral corundum have been much sought as gems because of their rarity, color and durability. Gem corundum can display asterism and chatoyancy due to the presence of oriented mineral inclusions, and in some cases, a change of color when viewed under different light sources.

Kathryn Kimmel
The first woman on the executive team and head of GIA’s innovative marketing and public relations efforts for nearly 30 years.

星夜 (Starry Night) 蓝宝石专题
通过美国宝石研究院 (GIA) 的透彻分析,这本专题文章记载了独特的星夜蓝宝石的宝石学特征,这将有助于我们了解该类宝石的光学影响、来源地以及形成方式。


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