JCK Online - October 1, 2000

A number of firms sell treated black diamonds, including Chromagem, Lotus, and Israel's First Diamond Group Ltd. Treated blacks are easier to find, cut, and match, and they take a better polish because the stones are not highly knotted or too heavily included. Prices for natural and treated blacks are comparable in melee sizes.At present, there are three treatments:Neutron irradiation.

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