The following tables show the AGA Cut Grading system for various diamond cuts developed by D. S. Atlas and his laboratory Accredited Gem Appraisers.
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Moissanite
In 1893, Nobel
Prize–winning French scientist Dr. Henri Moissan discovered
minute quantities of a new mineral, natural silicon carbide. The
mineral was located in an ancient meteorite found in the Diablo
Canyon in Arizona. Later named "moissanite" in honor of Dr.
Moissan, this mineral's supply was too limited for jewelry use.
More than a century later, Cree developed a process for
producing large, single crystals of moissanite. In 1995, a
master diamond cutter observed samples of the silicon carbide
crystals and suggested to the founders of Charles & Colvard
that, if properly cut, the crystals could make a beautiful
jewel. Charles & Colvard recognized the mineral's potential.
They also realized that in order for the moissanite jewels to be
used, they would have to be manufactured – there is essentially
no natural supply for this stone. In 1995, Charles & Colvard
partnered with Cree (a NC–based R&D lab) to develop larger
gemstones for Charles & Colvard to use in the Cree colorless
development program. In conjunction with Cree, Charles & Colvard
is the exclusive worldwide manufacturer and marketer of
lab–created moissanite gemstones.
Unquestionably the best & most realistic diamond substitute in
the world. Moissanite's brilliance, hardness, weight and scratch
resistance rival all other gemstones. This precious jewel
possesses all the romance and passion of rubies, emeralds and
sapphires.
