Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color
An investigation of the difference between synthetic opal and opal simulant.
Synthetic Gem Materials and Simulants in the 1990s
The 1990s witnessed important developments in the commercial viability of gem-quality synthetic diamonds.
"Opalite": Plastic Imitation Opal with True Play-Of-Color
A plastic imitation opal that shows true play-of-color 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.
Inamori Synthetic Cat's-Eye Alexandrite
This article reports on a detailed gemological examination of this new synthetic cat's-eye alexandrite.
Dyed Natural Corundum as a Ruby Imitation
The gemological properties of a new ruby imitation, produced by dyeing natural colorless to pale-colored corundum, are described.
An Examination of Nontransparent “CZ” from Russia
White, pink, and black nontransparent synthetic "cubic zirconia" is currently being manufactured in Russia and marketed primarily in cabochon and bead form.
Characterization of Colorless Coated Cubic Zirconia (Diamantine)
Over the past several years, diamond simulants have entered the market that consisted of colorless cubic zirconia reportedly coated with a thin layer (e.g., represented to be 30–50 nm) of nanocrystalline diamond particles embedded in a matrix.
Lepidolite with Simulated Matrix
The authors examine an unusual crystal in matrix.
The Early History of Gemstone Treatments
The author has uncovered many ancient references to the simulation or enhancement of gemstones.
Cobalt Glass as a Lapis Lazuli Imitation
The properties of a novel gemological imitation, cobalt glass.