Inamori Synthetic Cat's-Eye Alexandrite
This article reports on a detailed gemmological examination of this new synthetic cat's-eye alexandrite.
The Early History of Gemstone Treatments
The author has uncovered many ancient references to the simulation or enhancement of gemstones.
Synthetic Gem Materials and Simulants in the 1990s
The 1990s witnessed important developments in the commercial viability of gem-quality synthetic diamonds.
Characterisation of Colourless Coated Cubic Zirconia (Diamantine)
Over 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.
Dyed Natural Corundum as a Ruby Imitation
The gemmological properties of a new ruby imitation, produced by dyeing natural colourless to pale-coloured corundum, are described.
"Opalite": Plastic Imitation Opal with True Play-Of-Colour
A 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.
The Identification of Turquoise by Infrared Spectroscopy and X-Ray Powder Diffraction
Two techniques for identifying natural, treated and synthetic turquoise are examined.
A Simple Approach to Detecting Diamond Simulants
Contrasting the physical properties of diamond with colourless specimens to identify the most problematic diamond simulants.
Cubic Zirconia: An Update
An 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.
Synthetic or imitation? An investigation of the products of Kyocera Corporation that show play-of-colour
An investigation of the difference between synthetic opal and opal simulant.