In recent years, the obligation to fully disclose all gem treatments has changed from a mere ethical responsibility to a legal one.
Read MoreGems & Gemology, the professional quarterly of GIA, debuted in 1934
Read MoreSeveral gems were recently examined that showed stars with an unnatural appearance or an unusual number of rays.
Read MoreThe author has uncovered many ancient references to the simulation or enhancement of gemstones.
Read MoreThe author reviews the nature of this material and some of the forms into which it has been fashioned, as well as means of identifying hornbill ivory from other ivories and from imitations.
Read MoreExamination of 51 colourless to near-colourless synthetic diamonds from all known sources of production confirms that they can be distinguished from similar-appearing natural diamonds on the basis of their gemmological properties.
Read MoreLow levels of radioactivity were found in some greenish yellow to yellow-green (peridot-like) synthetic spinel-and-glass triplets, mirror-backed glass rhinestone chatons and fully fashioned glass rhinestones.
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Similarities between natural spinels - with intense blue colour - and synthetic material, have led to difficulties in the recognition of the natural stones by traditional methods.
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 MoreThe gemmological properties of a new ruby imitation, produced by dyeing natural colourless to pale-coloured corundum, are described.
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