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Rock crystal coated with brown skin.
Coated Rock Crystal Imitation of Ruby

A coated rough rock crystal resembles a purplish red ruby.

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Olive-green serpentine cabochon.
Serpentine Cabochon with Unusual Olive Green Colour

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

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Plastic bead with visible fragments of coral.
Coral Inclusions in Plastic

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

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Synthetic Ruby Overgrowth on Natural Corundum
Article
Analysis of Synthetic Ruby Overgrowth on Corundum

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

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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

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.

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IMG-FA13-LN 154325 300x169
Imitation Rainbow Moonstone Assemblage

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

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IMG-FA13-GNI 154373 300x169
Amber with Insect-Bearing Filling

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

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This 1.04 ct black submetallic round brilliant, initially represented as diamond, was identified as boron carbide. Photo by G. Choudhary.
Article
Boron Carbide: A New Imitation Black Diamond

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

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Synthetic Gem Materials and Simulants in the 1990s

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

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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.

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