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Glossary Jewellery / Term

Opalescence

Opalescence is a type of dichroism where a gem appears yellowish-red in transmitted light and blue in the scattered light perpendicular to the transmitted light. The phenomenon is named after the appearance of opals. This effect can be seen in nature in the way the sky is blue in the daytime and yellowish-red at sunset.

Permanent link Opalescence - Creation date 2020-05-12


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