Turquoise-Rock Crystal Composite
Examination of a faceted rock crystal backed by a slice of turquoise: an obvious but unusual combination of gem materials.
An opal-calcite composite
Gem Testing lab in Jaipur, India recently examined a white-brown, translucent to opaque oval cabochon that turned out to be a composite featuring an unusual combination of gem materials.
Composite amber with an unusual structure
This 9.12 gram amber composite featured a combination of natural and imitation amber, accompanied by natural and artificial insect inclusions.