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.
Boron Carbide: A New Imitation Black Diamond
Specimen sold as black diamond identified as ceramic material commonly used in hard-plating applications
Imitation Rainbow Moonstone Assemblage
Examination of an imitation rainbow moonstone assemblage containing plastic-coated gypsum.