Characterises a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.
Read MoreOverview and commentary on the 2013 Russian Diamonds and Jewellery article “New Reality of the Russian Jewellery Market”.
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A Fancy orangey-yellow “cape” diamond featured an unexpected 480 nm band, a defect normally associated with orange colour.
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The New York lab recently examined several diamonds with an interesting variation on the cabochon.
Read MoreAnalysis of Fancy Light greenish yellow diamond leads to detection of nickel, as well as an inclusion that gives a colour-change effect.
Read MoreUsing a multi-step process, Lucent Diamonds has developed a new treatment process for certain natural diamonds that creates colours from pink-purple to red to orangey brown.
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This article illustrates the various features in filled diamonds and explores the best techniques for examining them.
Read MoreSynthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterise it.
Read MoreTwo major sources of error make spectroscopically determined colour grades unreliable.
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A simple chart of optical defects in diamond, including those that produce colouration and fluorescence colours.
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