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HomeIGC 2025Zoisite and its many color
17. Nov
IGC 2025

Zoisite and its many color

Clemens Schwarzinger, Steve Ulatowski, George R. Rossman

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Other Gemstones
17. Nov
IGC 2025
Spinel from Sri Lanka – An update

Most of the spinels are found in shades of red to purple. Colourless, green and cobalt bearing varie

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Elodie
17. Nov
IGC 2025
Amber from the Thanbaya Gaing Coal Mine, Minbu Township, Magwe Region, Myanmar

Amber was recently discovered by local coal miners at the Thanbaya Gaing Coal mine located 6.5 km no

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Laurent Cartier
17. Nov
IGC 2025
Study of “amethysts” from the French Crown Jewels

Stefanos Karampelas, Eloïse Gaillou, Annabelle Herreweghe, Ugo Hennebois, Farida Maouche, Romain Bo

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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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