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HomeIGC 2025Application of Fibre Optics Reflectance Spectroscopy (FORS) for the determination of mineral pigments in jasper
17. Nov
IGC 2025

Application of Fibre Optics Reflectance Spectroscopy (FORS) for the determination of mineral pigments in jasper

Ulrich Henn

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OriginsOther Gemstones
17. Nov
IGC 2025
Gem zircon and sapphire age dating and application of origin determination: A study from New England sapphire fields, New South Wales, Australia

Ahmadjan Abduryim, Frederick Lin Sutherland, Terry Coldham, Elena Belousova Download Pdf

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Laurent Cartier
17. Nov
IGC 2025
Blue sapphire from Malacacheta of Minas Gerais, Brazil

Malacacheta, located in Minas Gerais, Brazil, is renowned for its alexandrite deposits and com-plex

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Laurent Cartier
17. Nov
IGC 2025
Noble gas in corundum: interests in gemology

Noble gases —elements of the last column of the periodic table—are chemically defined by their f

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Elodie

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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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