Latter by the design of the god, these fingernails were transformed into stone that came to be known to the world as onyx. The name draws its origin from the word, onyx which in Greek language means fingernails. In latter course of history, this stone became famous in the hands of Romans, who crafted beautiful seals out of onyx.
The patterns were cut into negative reliefs which were famously called intaglios. The myth that for this gemstone originated from the body part of Venus, known for alluring beauty, justifies the stones fine texture and lustrous black color. Originally onyx is chalcedony quartz, which falls in the microcrystalline category. It is formed in the gas cavities of lava. This gemstone is basically a multilayered stone like agates and depending on the different colored layers, onyx can be divided into a few separate categories.Generally, when the stone has a black base and a white upper layer, it is called Onyx. Some onyx displays white and lighter reddish bands or ribbons of silicon di-oxide against a brown background, this variety is known as Sardonyx. When the onyx has a red base, it is known as Cornelian-onyx.
The black onyx, the most popular among all the varieties of onyx actually is grey chalcedony. The rich black color is the result of profuse chemical treatment. In order to bring out the black, the grey stone is saturated with a solution of cobalt chlorate and chlorammonium. Immersion of the stone for a prolonged period in a sugar solution and then heating in sulphuric acid to carbonize the sugar also leave the stone with a brilliant black color. This stone has a moderate hardness.
The item "VINTAGE STERLING SILVER BLACK ONYX GEMSTONE NECKLACE SIGNED QT EARRINGS PERIDOT" is in sale since Sunday, March 24, 2019. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Necklaces & Pendants\Gemstone". The seller is "4744366" and is located in Andover, Massachusetts. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia.