This 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.
Read MoreThe gemmological properties of a new ruby imitation, produced by dyeing natural colourless to pale-coloured corundum, are described.
Read MoreA plastic imitation opal that shows true play-of-colour was advertised as "new" and offered for sale under the trade name "Opalite" at the Gem and Lapidary Dealers Association (GLDA) Tucson show in February 1988.
Read MoreTwo techniques for identifying natural, treated and synthetic turquoise are examined.
Read MoreContrasting the physical properties of diamond with colourless specimens to identify the most problematic diamond simulants.
Read MoreAn examination of the skull-melting technique used to produce cubic zirconia, first introduced in 1976, as well as the market status of this diamond simulant and information about its production and quality.
Read MoreAn investigation of the difference between synthetic opal and opal simulant.
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