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In 1837 Gaudin made
the first synthetic
rubies by fusing
alumina at a high
temperature with a
little chromium as a
pigment by fusing
BaF2 and Al2O3 with
a little chromium at
temperatures above
2000°C.
Synthetic corundum
is being used widely
in Jewelry designs.
They are very hard
that only comparable
the hardness with
only a few
substances on the
Earth.
Synthetic Corundum
is the most famous
from the above
category. These
stones have a Mohs
hardness rating of
9, which is
comparable to the
diamond hardness
rating of 10.
With all the above,
synthetic corundum
have now become a
favorite to most of
people use to
substitute for
Precious Gems Stone
in the world. |
