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HomeIGC 2025Gem-quality pink fluorite from Planggenstock, Switzerland: chemical and physical properties and a comparison with pink fluorites from other localities
17. Nov
IGC 2025

Gem-quality pink fluorite from Planggenstock, Switzerland: chemical and physical properties and a comparison with pink fluorites from other localities

Michael F. Hügi, Michael S. Krzemnicki, Markus Wälle

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GemmologyGeochemistryOriginsOther Gemstones
17. Nov
IGC 2025
Morphologies and Surface Features of Diamond Samples from Southern Thailand

In 1955, the first report on Thai diamond was made by Dr. Payome Aranyakanon, a renowned tin explora

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Laurent Cartier
17. Nov
IGC 2025
Padparadscha Sapphire & heat treatment

In 2018 the Padparadscha engagement ring of Princess Eugenie (Figure 1), the niece of the king, gave

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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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