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Black Onyx Meanings and Properties


Black Onyx History

The name "onyx" comes from the Greek word for "fingernail," referring to the translucence of the white-colored layer of this multi-layered stone. According to myth, Cupid trimmed the nails of the sleeping goddess Venus. The Fates turned those clippings into stone to prevent even a part of Venus from dying.

The Romans were experts at glyptography (the carving of layered stones to reveal different colors) and crafted beautiful seals from onyx (white layer over black base) and sardonyx (white layer over reddish-brown base). The patterns were cut in negative relief. Engravings with a negative picture are called intaglios and those with raised image are cameos. In the Middle East, onyx was associated with sorcerers.

While ruby is the birthstone for July, black onyx is an alternative stone for the month and is associated with the Babylonian Zodiac sign of Capricorn.

Black Onyx Metaphysical Properties

Black has been associated with regeneration and new beginnings. Black onyx is thought by some to have protective qualities, making it advantageous to carry when traveling. It is said to be useful in fighting basic fears and helping to move beyond bad relationships--as well as to heal old emotional wounds. The Romans associated onyx with courage and it is thought to be useful when one is defending him/herself against unfair criticism.

Black Onyx Geological Properties

Onyx is a form of chalcedony, which is a microcrystalline quartz formed in the gas cavities of lava. Its multi-layered structure is similar to that of agates. When the stone has a black base and a white upper layer, it's called onyx. (Black onyx is uniformly black chalcedony.) When the base is brown, it is called sardonyx while carnelian-onyx has a red base.

Much of what is referred to as "black onyx" is gray chalcedony that has been chemically treated to be a rich black. The gray stone can be saturated with a solution of cobalt chlorate and chlorammonium, or it can be immersed for a prolonged period in a sugar solution and then heated in sulphuric acid to carbonize the sugar.

Brazil supplies the best multicolored raw material, but onyx is found worldwide. Gray chalcedony is found in India and China.

Mineral Information Microcrystalline quartz, chalcedony group
Chemical Composition SiO2
Color Black, usually dyed these days
Hardness 6-1/2 to 7 (Mohs)
Specific Gravity 2.58 - 2.64
Refractive Index 1.530 - 1.539

Proper Care of Black Onyx

Black onyx is a relatively soft stone and is fairly porous, so it should not be cleaned with harsh chemicals (they can seep in and alter the color of the stone), steamers or ultrasonic cleaners. Even mild detergents are not recommended. The best method for cleaning black onyx is a soft, dry cloth or brush. The cloth can be moistened with water when necessary. If you do wet the stone, be sure to dry it before storing or wearing.

Put on your onyx jewelry after you've applied makeup, hair products and perfumes so the chemicals do not end up soaking into the gemstone. Store onyx jewelry in a soft cotton or velvet cloth so the stone does not end up scratched by harder stones and metal settings.

To learn more about black onyx and other gemstones, order your copy of Walter Schumann's revised and expanded edition of Gemstones of the World.

Designing with Black Onyx

Black is neutral, making it a great design element to combine with many different colored stones, other gemstone beads and all metal tones. Its deep, dark, lustrous surface can play a striking contrast to the warm-colored gemstones like garnet, carnelian and coral. Or combine it with any stone containing a black matrix such as lapis lazuli, rhodonite and turquoise to heighten these stones' vein detailing.

View design inspirations featuring black onyx in the Gallery of Designs

Shop for Black Onyx Items

**Please note that all metaphysical or healing properties listed are collected from various sources. This information is offered as a service and not meant to treat medical conditions. Fire Mountain Gems and Beads® does not guarantee the validity of any of these statements.

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