FOUND IN

India and South America

COLOUR

BLACK

HARDNESS

7

Onyx is an opaque black stone which is a member of the chalcedony quartz group. The name onyx is properly applied only to the agate variety. Other varieties include Sardonyx, with white and red bands.  Onyx has long been in demand for use in signet rings and enjoyed its greatest vogue during the Art Deco period of the 1920s and 1930s because its black colour lent itself to geometrical arrangements and provided a bold contrast with diamonds and pearls. Some onyx is natural but much is permanently dyed brown onyx or agate.

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