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Boart means industrial quality diamond (by nature heavlily included, near opaque), carbonado is the variety. Almost any boart can be heated to make black. There are 3 types of black diamonds, 1)Natural Black (opaque but slightly traslucent) 2)Irradiated (white, transparent, cloudy diamond, I1 to I3 clarity), can be transformed to black (opaque, slightly translucent, green traces when viewed with strong light) and finally 3)Boart diamond (60% of the diamond production). Entire diamond appear black (brownish to acerated hues), completely opaque, zero light can enter to it. From price point of view. Natural Black from 500 per carat, Irradiated Black from 150 per carat, boart heated to black from 50 per carat, so watch carefully what you`re buying.

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What is the colour of bort diamond?

Bort is a name used to describe industrial diamonds, which are not of gem quality. Often they look like dirty gray stones.


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What is a boart?

A boart is another term for a bort, a poor-quality or badly-crystallized diamond.


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Diamond is a crystalline form of carbon which has a density of has a density of 3.51 gm/cm3 compared to 2.26 gm/cm3in the graphite form. Imperfectly formed crystalline forms of diamond are called bort and black diamond.Source: http://hyperphysics.phy-astr.gsu.edu/hbase/minerals/diamond.html


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