SARDONYX: refers to a form of translucent Agate (Chalcedony Quartz) which is combined with bands of opaque Sard (brownish red) or opaque Onyx (white or black). Sardonyx is distinguishable in that its banding is straight and parallel, rather than curved or wavy as normally associated with most Agate varieties.

Roman soldiers wore Sardonyx talismans engraved with heroes such as Hercules or the god of war, Mars. They believed that the stone would make the wearer as brave and daring as the figure carved from it. During the Renaissance, Sardonyx was believed to bring eloquence upon the wearer and was regarded with great value by public speakers and orators. This gemstone is believed by many to eliminate negative thinking as well as sharpen the wits of the wearer.