Sardonyx is a geological oddity of a stone – essentially, it is Sard mixed with Onyx. The red Sard creates an interesting contrast between the white or black Onyx.

Sardonyx has been used since antiquity for various things, including seals and cameos and other decorative objects made by the Assyrians, Romans, Greeks and Phoenicians. It is a perfect stone for carving hard cameos, as it has very contrasting layers.

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