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.
Coated Rock Crystal Imitation of Ruby
A coated rough rock crystal resembles a purplish red ruby.
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.
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.
Amber with Insect-Bearing Filling
Natural amber beads were found to have been filled with plastic and a variety of insects.