How variations in UV lamp output can affect observed fluorescence colour and intensity.
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A survey of recent advances in CVD synthetic diamond quality.
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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.
Read MoreEight decades after the Cullinan diamond was mined, a team of gemmologists examined the two famous gems that were created from it to become part of the Crown Jewels of England.
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The Oved Diamond Company’s new glass formulation is tested with mixed results.
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Several diamonds were treated for the purposes of observation and report with a new laser technique which does not show the typical surface-reaching drill hole.
Read MoreOver the last 25 years, the diamond-cutting industry worldwide has been revolutionised by sophisticated instruments that provide invaluable aid in the process of creating a polished gem.
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This article illustrates the various features in filled diamonds and explores the best techniques for examining them.
Read MoreTo evaluate possible problems in separating gem materials coated with a synthetic diamond thin film from their uncoated equivalents, we examined one sample of a free-standing, polycrystalline diamond film about one micron (0.001 mm) thick.
Read MoreThis article reports on the study of six diamonds, both before and after a filling treatment, and the examination of 12 additional filled stones.
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