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In jewelry design as in fashion, colors look crisper against a background of black, and black and white always looks right. In fine jewelry, the black backdrop is often supplied by onyx, a chalcedony quartz with a fine texture and black color. Some onyx also displays white bands or ribbons against a black background. If the layers are even, this type of onyx can be carved into cameos.

. Onyx was very popular with the ancient Greeks and Romans. The name comes from the Greek word "onux", which means fingernail. The story is that one day frisky Cupid cut the divine fingernails of Venus with an arrowhead while she was sleeping. He left the clippings scattered on the sand and the fates turned them into stone so that no part of the heavenly body would ever perish. True, black isn't normally the color one associates with fingernails. (Did Venus wear Vamp?) But in Greek times, almost all colors of chalcedony from fingernail white to dark brown and black were called onyx. Later, the Romans narrowed the term to refer to black and dark brown colors only. Onyx which is reddish brown and white is known as sardonyx. Sardonyx was highly valued in Rome, especially for seals, because it was said to never stick to the wax. Roman General Publius Cornelius Scipio was known for wearing lots of sardonyx ornaments and rings.

Black onyx especially shines when used as a backdrop for color play. Its fine texture also makes it ideal for carving, making it a favored material for today's lapidary artists.. Onyx was often used as the perfect foil for carved rock crystal, or the drop dead red of rubies in Art deco designs. It is also popular in marcasite jewelry. So if you would like to add a little black magic to your jewelry design, consider onyx.

Onyx - Main Characteristics

Hardness (Mohs Scale)Seven (7)
Molecular formulaSiO2
Crystal Shape-
Color/SpectrumBlack, Dark Red.
Atomic (Crystal )Structure -
Index of Refraction1.52 - 1.54
Density (Relative)2.58 - 2.62
Light interactionOpaque
UsesJewelry, rings, ornamental.

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