GIA researcher analyses and confirms that De Beers’ Lightbox diamonds are grown using the chemical vapour deposition process.
Read MorePresents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.
Read MoreCompares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).
Read MoreCompares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.
Read MoreSuggested Reading on Sapphires and their Inclusions
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By Bernhard Dischler, 467 pp., publ. by Springer-Verlag Berlin and Heidelberg GmbH & Co., Berlin; New York, 2012, US $120
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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.
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How variations in UV lamp output can affect observed fluorescence colour and intensity.
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Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.
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