Article Search Results

Show Filters
Showing 14 results for "*"
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.

Read More

Synthetic Gem Materials and Simulants in the 1990s

The 1990s witnessed important developments in the commercial viability of gem-quality synthetic diamonds.

Read More

"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.

Read More

Inamori Synthetic Cat's-Eye Alexandrite

This article reports on a detailed gemological examination of this new synthetic cat's-eye alexandrite.

Read More

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.

Read More

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.

Read More

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.

Read More

Lepidolite with Simulated Matrix

The authors examine an unusual crystal in matrix.

Read More

The Early History of Gemstone Treatments

The author has uncovered many ancient references to the simulation or enhancement of gemstones.

Read More

Cobalt Glass as a Lapis Lazuli Imitation

The properties of a novel gemological imitation, cobalt glass.

Read More