It is Professor Henri Moissan that first discovered moissanite
in 1904. Moissanite is extremely rare in nature, specimens that
have been found are too small and too rare, they do not form
naturally in nature so they cannot be mine like other minerals.
Instead they are found in meteorites, a litle gift from above! In
1907 the first application of silicon carbide was produced as an
abrasive and cutting material.Today SiC has been called the
"material for the future" due to its many applications. For people
in the jewellery trade SiC or synthetic moissanite is a very
exceptional good imitator of diamond. Because of its properties
such as high thermal conductivity, hardness (9.5) and refractice
index (2.65) this material is the closest to diamond than any
other gem materials. Most jewelers who had the opportunities to
look at the material mistakenly identified synthetic moissanite
A press release dated July 31st, 97 from Cree Research,Inc.
state as follow : “A product release by C3 is scheduled for the
first calender quarter of 1998.”
Also C3 is taking a very strong position about the full
disclosure of the qualities of synthetic moissanite.
Apparently synthetic moissanite will cost more than CZ but much
less than the genuine diamond : $50. TO $7O. per carat ??? The
annual market for CZ at present is over $200.millions !!!
I doubt very much than your piece of rough was synthetic
moissanite, first it is not on the market yet. I also doubt very
much it is natural moissanite, you did cut a 5mm stone out of it,
way too big (if it is you have a museum piece!).Your rough was
easy to cut, synthetic moissanite has a hardness of 9.5 which is
between corundum 9 and diamond 10. Now diamond is 140 times
harder than corundum. What did you cut it with and polished it
with ? Your dealer oriented and marked the rough where to cut the
table, most likely because the stone is doubly refractive and was
trying to minimize the double refraction. Your cut stone lack
brilliance, synthetic moissanite is visually similar to diamond.
Out of curiosity find someone (gemmologist) in your area to find
out what you have been sold (they might be some of that same
stuff in the next parcel you buy, but next time you might not be
told!!!) and run those tests:
- polariscope, find if your stone is singly or doubly refractive,
- set it on the refractometer, get an RI,
- immerse it in a set of SG liquids, find its SG,
- look at it through a microscope, find the inclusions,
if you can’t get an RI and SG , find what it does under SW/LW/UV
lights see if you can get an AS on the spectroscope.
Have fun with your mysterious stone. Give me the results, may be
we can solve the mystery.