What is onyx?

Onyx is a semi -precious form of chalcedony, which has alternating straight colors, most often brown, red, white and black. Chalcedony is the name of the group for a large family of stones, all of which are forms of silicon oxide oxide, also known as quartz. In order to be classified as chalcedony, the stone must be milk and translucent for transparent, often with layers or stripes of colors. The color of onyx, as with other forms of chalcedony, is formed through the dirt that penetrates the rock as it works. This form is sometimes also called Sardonyx, because red belts resemble Sarda, another type of chalcedony. The black stripes will rarely be mixed, or onyx will be primarily black. Black Onyx is highly valuable for use in jewelry and ornaments. Other colors can also be found even if they are less common.

Unfortunately, the color of Onyx is often created by the intention of chemical treatment and heat. It may be difficult to find out whether the stone has been stained or treated with heat because sellers are not obliged to zveřejnit. In the case of Onyx, which has gone through several hands, the seller may not know whether the stone is natural or not. Although colors should not disappear or distort, some people prefer the idea that their jewelry is made of natural rocks in their real colors, rather than artificially improved.

Onyx shows in jewelry is used a number of cuts. Usually Cabochon or other large rounded cut will be made to show colors in the stone. The high lacquer is achieved by plastering the rock and the stone is often set in a deep and strong environment that will further increase the natural beauty of the stone. In particular, Sardonyx is also used to produce portraits, because even color belts are well deceived by classic two -color carving.

To take care of onyx, people should take care of not to hit or rap their jewelry, as it can cause stone rupture. Onyx is reasonably hardy even if it should be pRava probably avoid exposure to excessive sunlight and harsh chemicals. If onyx is set in metal, the settings should be regularly checked to make sure it is not free. Onyx beads may benefit from periodic cleaning and polishing to remove dirt and should be transported to the jeweler for cleaning.