Gemstones & Pearls:News
Newsbyte:Product Simulates Tanzanite
A new product that simulates tanzanite is
slated to appear on the market by early summer, sources tell Professional
The material, which is manufactured in Russia, had not been given a name
at press time and was being kept under wraps.
According to sources who have seen it, the material is remarkably like
high-quality tanzanite in appearance. It is doubly refractive and orthorombic
and has a refractive index of 1.67, a specific gravity of 3.2 and a birefringence
of 0.036 all properties that are close to those of tanzanite.
What's particularly interesting, sources say, is the simulant's optical
and physical properties do not overlap with those of synthetic corundum
or synthetic garnet, both of which have been used as tanzanite simulants.
The new product may not have a counterpart in nature. Observers say further
the material can be separated from natural tanzanite using standard gemological
visual techniques or with a filter known as an "aquamarine filter,"
which allows the examination of large stone parcels.
Robert Weldon, G.G.
Copyright © 1999 by Bond Communications.