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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.

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.

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.

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.

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.

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