Remarkable Hexagram Pattern Produced by a Trapiche Emerald from Colombia
The unique trapiche emeralds from Colombia exert a fascination for many gemologists. A special trapiche emerald weighing...
GUILD 知识与研究
研究成果|40余年卓越积淀
学术研究
研究论文
经同行评审的研究成果、学术会议演讲及学术贡献，持续推动宝石学科学与实践的发展。
A Purple Sapphire Containing Interesting Inclusions: Formation Insights
Recently, the authors examined a cushion-shaped purple sapphire weighing 3.56 ct (Figure 40a). The RIs were 1.762–1.770, yielding a birefringence of 0.008, consistent with sapphire. FTIR spectroscopy confirmed its identification as corundum. The stone displayed strong red fluorescence to long-wave (365 nm) UV radiation (Figure 40b). Chemical analysis by EDXRF spectroscopy revealed appreciable Cr (about 720 ppm) and Fe (approximately 1,200 ppm), along with some Ti (around 230 ppm).
A Pink Sapphire with Questionable Heat Treatment
A pink sapphire weighing over 20 ct was recently submitted to Guild Gem Laboratories, and it presented a particularly ch...
'Sugar' Nephrite from the Altun Mountains, Xinjiang, China
Nephrite has a long history and profound culturalsignificance in China, along with a vast consumer market. In July 2025,...
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来自GUILD全球持续实地作业的影像记录——从矿区到加工中心，再到市场，真实呈现宝石学知识诞生的现场。
