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...
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研究成果|40余年卓越积淀
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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).
An Unusual Inclusion Formation of Anatase and Rutile in Quartz
The study of inclusions within gem materials provides important insights into their crystallisation processes and the ge...
'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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