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Black Onyx Pendants
Onyx, sard, and sardonyx are all varieties of chalcedony
(microcrystaline quartz). Onyx comes in brown, white, grey, and black. Sard is a
reddish-brown variety. Sardonyx is a blend of sard and onyx with the red bands
of sard and the white bands of onyx. Onyx, Sard and Sardonyx all have a hardness
rating of 7. Onyx is very similar to agate. Onyx has straight bands of brown,
white or black; agate has curved lines of many colors.
Since ancient times, Onyx has been
dyed to improve it's
color. Black Onyx sold today is most often clear
agate that
has been dyed black.
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Wonderful commercially cut 10x14 oval that I set in pure sterling silver. Very elegant.
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