Irradiation

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The process of exposing certain gemstones to a radioactive substance with the effect of artificially inducing a change of colour. This has been done with some diamonds. The original colours aresometimes partly restored by heating.

Explanation on irradiation by Adin antique jewelry
Adin Academy

Irradiation

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The process of exposing certain gemstones to a radioactive substance with the effect of artificially inducing a change of colour. This has been done with some diamonds. The original colours aresometimes partly restored by heating.

Also known as:

References

From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson