Article Search Results

Coated Rock Crystal Imitation of Ruby

Nazar Ahmed Ambalathveettil and Mohamed Karam, November 23, 2015

A coated rough rock crystal resembles a purplish red ruby.

Plastic bead with visible fragments of coral.

Coral Inclusions in Plastic

Gagan Choudhary, November 23, 2015

An orangey-red plastic bead is revealed to be a composite when white coral fragments are identified by spectroscopy and gemmological properties.

Serpentine Cabochon with Unusual Olive Green Colour

Yanjun Song and Lu Zhang, November 23, 2015

A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.

Synthetic Ruby Overgrowth on Natural Corundum

Article

Analysis of Synthetic Ruby Overgrowth on Corundum

Sudarat Saeseaw, Vincent Pardieu, Vararut Weeramonkhonlert, Supharat Sangsawong and Jonathan Muyal, June 25, 2015

Analysis of synthetic ruby overgrowth on corundum, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.

This 1.04 ct black submetallic round brilliant, initially represented as diamond, was identified as boron carbide. Photo by G. Choudhary.

Boron Carbide: A New Imitation of Black Diamond

Gagan Choudhary, October 17, 2013

The Gem Testing Laboratory in Jaipur identified a black diamond-like specimen as boron carbide, a ceramic material typically used in nuclear, military, and aerospace applications.

Imitation Rainbow Moonstone Assemblage

Amy Cooper, Nathan Renfro, and Tara Allen, October 17, 2013

Examination of an imitation rainbow moonstone assemblage containing plastic-coated gypsum.

Amber with Insect-Bearing Filling

Sutas Singbamroong, October 17, 2013

Natural amber beads were found to have been filled with plastic and a variety of insects.

Article

Boron Carbide: A New Imitation Black Diamond

Gagan Choudhary, September 13, 2013

Specimen sold as black diamond identified as ceramic material commonly used in hard-plating applications

Synthetic Gem Materials and Simulants in the 1990s

John I. Koivula, Maha Tannous, December 1, 2000

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

Synthetic or imitation? An investigation of the products of Kyocera Corporation that show play-of-colour

Karl Schmetzer and Ulrich Henn, September 1, 1997

An investigation of the difference between synthetic opal and opal simulant.

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Gemstones

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Gemstones

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