Treated Specialist VC

Treated Specialist VC Viral Corporation
DW 1360 Bharat Diamond Bourse
Bandra (East) Mumbai The two most common irradiation methods are neutron and electron bombardment.

The former treatment produces a green to black color that penetrates the whole stone, while the latter treatment produces a blue, blue-green, or green color that only penetrates about 1 millimeter deep. Annealing of these stones (from 500–900 °C for neutron-bombarded stones and from 500–1200 °C for electron-bombarded stones) produces orange, yellow, brown, or pink. Blue to blue-green stones that a

re not annealed are separated from natural stones in the same manner as gamma ray-treated stones. Prior to annealing, nearly all irradiated diamonds possess a characteristic absorption spectrum consisting of a fine line in the far red, at 741 nm — this is known as the GR1 line and is usually considered a strong indication of treatment. Subsequent annealing usually destroys this line, but creates several new ones; the most persistent of these is at 595 nm.

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