Imitation diamonds such as CZ and moissanite have been popular for decades. Learn about their properties and how they compare to diamonds.
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An orangey-red plastic bead is revealed to be a composite when white coral fragments are identified by spectroscopy and gemmological properties.
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A coated rough rock crystal resembles a purplish red ruby.
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A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.
Read MoreWhen General Electric created the first gem-quality synthetic diamonds in 1971, the first place the company sent them after cutting was to GIA for examination and research. In the 44 years since then, GIA researchers have closely followed the development of laboratory-created diamonds – from those early experiments to the production of commercial quantities in the gem market.
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Analysis of synthetic ruby overgrowth on corundum, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.
Read MoreThis article reports on a detailed gemmological examination of this new synthetic cat's-eye alexandrite.
Read MoreThe author has uncovered many ancient references to the simulation or enhancement of gemstones.
Read MoreThe 1990s witnessed important developments in the commercial viability of gem-quality synthetic diamonds.
Read MoreOver the past several years, diamond simulants have entered the market that consist of colourless cubic zirconia reportedly coated with a thin layer (e.g. represented to be 30–50 nm) of nanocrystalline diamond particles embedded in a matrix.
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