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HomeIGC 2025Low Temperature Heat Treatment of Madagascar Sapphire
17. Nov
IGC 2025

Low Temperature Heat Treatment of Madagascar Sapphire

E. Billie Hughes and Rosey Perkins

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SapphireTreatments
17. Nov
IGC 2025
Shining light on “480 nm band” diamonds: Gemmological characteristics of an unusual group of diamonds with yellow and red luminescence

Fancy colour diamonds that derive their colour from nitro- gen-related defects (such as N3/N2 center

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Elodie
17. Nov
IGC 2025
Dyed purple Jade (Lavender jade or purple “Fei Cui”) from Mandalay’s jade market, Myanmar

Jade or "Fei Cui" are trade names for a stone that typi- cally contains only one or more main minera

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Elodie
17. Nov
IGC 2025
Fe-Ti charge transfers: A comprehensive review and its applications to minerals and gems

The iron-titanium charge transfer (Fe-Ti CT) is mentioned in numerous articles as the source of the

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Laurent Cartier

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Age dating Diamond Emerald Gemmology Geochemistry IGC Jade Organics Origins Other Gemstones Pearl Ruby Sapphire Spinel Synthetics Tourmaline Treatments

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