Serpentine Cabochon with Unusual Olive Green Color
A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.
Coral Inclusions in Plastic
An orangy red plastic bead is revealed to be a composite when white coral fragments are identified by spectroscopy and gemological properties.
Coated Rock Crystal Imitation of Ruby
A coated rough rock crystal resembles a purplish red ruby.
Color-Change Synthetic Cubic Zirconia as Peridot Imitation
A greenish yellow material set in a ring as a peridot imitation is identified as synthetic cubic zirconia.
Amber with Insect-Bearing Filling
Natural amber beads were found to have been filled with plastic and a variety of insects.
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.