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 The stones: very beautiful stone of more than 1 carat. |
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The fancy colors stones are those with color that
does not lies between the bluish white and the yellowish. The color of fancy
colors diamonds is blue, green, pink, yellow, brown, etc... |
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The closed stones: are monocrystals, beautiful shapes,
good for sawing and polishing. |
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The spotted stones: are monocrystals, beautiful shapes,
these stones have inclusions but it is possible to make them disappear with the cutting. |
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The naats: are deformations of crystallizations, they must be cleaved or bruted. |
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The irregular stones: are octahedral or dodecahedral
(irregular shapes), they are directly cut. |
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The cleavable stones: they must be cleaved. |
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The coated stones: the industry have named coated
stones « speculation stones ». A gangue or a film covers them hiding the interior of the stone. They can remain
opaque or let appear a beautiful stone. |
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The frosted stones: are identical to coated, but the
film is translucent. |
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The milky stones: as its name indicates, this
stone has a milky aspect. |
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The blocks: of a particular shape, their
crystallographic orientation is difficult to see. |
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The plats: in fact generally macles are very often
employed for the rose cut. |
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The sands: they are very small stones (less
than 0.10 carat), mostly used for the size 8/8 |
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The commons goods: they are of a very poor
quality and they are the extreme product of the gem quality. |
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The rejections stones: they are of very bad
quality and therefore must be eliminated. |
Rough diamond sorting
Principal crystalline shapes
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