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

Blue sapphire from Malacacheta of Minas Gerais, Brazil

Masaki Furuya

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Sapphire
17. Nov
IGC 2025
Geographic Origin Determination of Natural Yellow Sapphires: The Preliminary Study

Determining the geographic origin of yellow sapphires plays a critical role in the gem trade, as ori

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Laurent Cartier
17. Nov
IGC 2025
Pink-orange gem quality euclase from Bahia, Brazil

Euclase, monoclinic crystal system—is a seldomly occurring mineral and with a Mohs hardness of 7 a

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Elodie
17. Nov
IGC 2025
Historic Emeralds and their Geographic Origin: A Retrospective Study

When it comes to the geographic origin of gems, curiously enough, historians sometimes put forward p

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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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