Explore the world of diamonds and colored gemstones.

Figure 1. Emerald crystals from Colombia (top right), Afghanistan (bottom right), and Zambia (left). Each emerald’s hexagonal prismatic crystal habit has been enhanced by polishing flat the two ...

Copyrights and Trademarks | Privacy Notice | Terms of Use | Cookie Notice | Ethics and Compliance | Transparency in Coverage Rule | About This Site © 2002 - 2026 ...

Figure 1. The sapphires in this necklace, ranging in size from 2.4 to 6.7 ct, were reportedly produced in Baw Mar. This is one of the pieces that recently made its way to the Gübelin Gem Lab; some of ...

Approaching his 50th anniversary in the business, Stephen M. Avery (Lakewood, Colorado) reflected on his journey to becoming an award-winning lapidary artist, detailing his signature cuts and gem sets ...

GIA美国宝石研究院将于2024年推出更新版珠宝工艺师（Graduate Jeweler）文凭课程。