Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
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G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.
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G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.
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A Fancy orangey-yellow “cape” diamond featured an unexpected 480 nm band, a defect normally associated with orange colour.
Read MoreAnalysis of Fancy Light greenish yellow diamond leads to detection of nickel, as well as an inclusion that gives a colour-change effect.
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How variations in UV lamp output can affect observed fluorescence colour and intensity.
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A simple chart of optical defects in diamond, including those that produce colouration and fluorescence colours.
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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 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.
Read MoreThis article compares some of Chatham Created Gems’ synthetic coloured diamonds to natural diamonds and explains the results.
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