Rare phosphorescence was observed in a synthetic sapphire, which had unusual properties not indicative of a particular growth method.
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An opaque carving was identified as colour-coated corundum based on visual features, as RI and SG could not be measured because of the piece’s large size.
Read MoreExamination of a 0.40 ct near-colourless round brilliant diamond with a large inclusion resembling a dumbbell
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