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marquise cut
also navette cut, reportedly named after the marquise de pompadour

millenniums cut
see concave cut

mixed cut
upper and lower part of the stone are cut in different styles e.g. upper part brilliant or scissors cut, lower part step cut or 3-4 rows of rectangular facets

mohs hardness
the degree of hardness of minerals according to the scale of hardness published in 1822 by the german mineralogist friedrich mohs.

1	talc	talk
2	gypsum	gips
3	calcite	kalzit
4	fluorspar	flußspat
5	apatite	apatit
6	orthoclase feldspar	orthoklas feldspat
7	quartz	quarz
8	topaz	topas
9	corundum	korund
10	diamond	diamant

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