Onyx is black and white banded agate (cryptocrystalline or chalcedony quartz). It should not to be confused with onyx marble, which is limestone. The banding of onyx is parallel and consistent. Some varieties of onyx differ in color, such as sard onyx, which has a brown base and white upper layer, cornelian onyx, which has a red base and white upper layer, and niccolo onyx, which has a very thin upper layer, allowing the black base color to show through as grey or blue. Onyx takes its name from the Greek word "onux", which means fingernail; this could be due to a Greek legend, in which Eros mischievously cut the fingernails of Aphrodite with an arrowhead whilst she slept, and the gods turned the clippings into stone. Onyx was cut and carved as a gemstone by the Ancient Greeks and Romans in cameos. Intaglio etchings (negative relief engravings) were also made from onyx. These carvings showcase the banding of onyx.
Onyx Gemstone Properties
Hardness: 6.5 - 7
Specific Gravity: 2.58 - 2.64
Refractive index: 1.530 - 1.540
Onyx Color & Occurence
Onyx has a black base and white upper layer, but may contain bands of various other colors between these layers. In gemstones, onyx may also be one single color. In the case of sard onyx, the base layer is brown, cornelian onyx has a red base layer and niccolo onyx has a very thin upper layer, which allows the black base layer to show through as grey or blue. A lot of onyx gemstones are completely black.
Onyx deposits are found in countries all over the world, including Argentina, Australia, Brazil, India, Botswana, Madagascar, Mexico, Myanmar (Burma), Pakistan, Sri Lanka, Uruguay and the USA.
Healing Power of Onyx
Black onyx is thought to have protective properties and to bring inner strength, self-confidence and mental discipline to its wearer. Additionally, onyx is said to help to release negative emotions and alleviate fear and anxiety.
Mystical Power in Onyx
onyx is believed to help in wound healing, childbirth, eye and ear problems and to benefit the skin, hair, teeth and nails. Onyx is the birthstone for the zodiacal sign of Leo and the seventh wedding anniversary gemstone. Like many gemstones, some cultures believe onyx to be unlucky, but others consider it to be virtuous and to protect against black magic.
Buy Onyx in Kolkata
A1 Gems is a gemstone shop in Kolkata, we have natural Onyx in stock which are certified, our Onyx are procured directly from mines and our natural Onyx are free from any treatment, if you want to buy Onyx in Kolkata then feel free to contact us at +91 94335 46997