A new diamond imitation, synthetic moissanite (silicon carbide),
is now being produced by C3 Inc. in near-colorless form for jewelry
purposes. With refractive indices of 2.648 and 2.691, a dispersion
of 0.104, a hardness of 9� on the Mohs scale, and a specific
gravity of 3.22, synthetic moissanite is much closer to diamond in
overall appearance and heft than any previous diamond imitation.
The thermal properties of synthetic moissanite are also so close to
those of diamond that the thermal probes currently on the market
react to synthetic moissanite as if it were “diamond.” This new
material can be readily separated from diamond on the basis of its
anisotropic optical character, which produces a doubling in the
appearance of facet junctions. A new instrument manufactured by C3
Inc. solely to distinguish synthetic moissanite from diamond was
also examined for this study.
This was taken from the Gems and Gemology home page.
Michael Mathews Victoria,Texas USA