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What is a gem? And why painite from Myanmar can fetch US$60,000 per carat

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What makes a stone a gem? It boils down to a few key qualities: beauty and durability. But opal, the national gemstone of Australia, is an anomaly - it’s soft.

UQ News on X: What is a gem? And why painite from Myanmar can fetch US$60,000 per carat. #UQ's Dr Andrew Christy writes on @ConversationEDU / X

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