Summarises data collected on more than 15,000 natural blue/grey/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this colour range.
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Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular and Resorbed), that formed in a super-deep environment.
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A simple chart of optical defects in diamond, including those that produce colouration and fluorescence colours.
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An examination of the gemmological and spectroscopic properties of CVD synthetic diamonds from Gemesis Corp.
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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 MoreA simplified form of X-ray topography can fingerprint faceted diamonds to aid in their recovery from loss or theft.
Read MoreThis article presents information about the CVD process, the history of its development, and properties that differentiate the resulting synthetic crystals from natural diamond.
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This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.
Read MoreWith the information from a combination of tools now available, the sophisticated gemmologist can fingerprint a given stone.
Read MoreA mathematical model which can analyse how appearance factors depend on proportions.
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