Quantity: 2+ounces Pieces measure, on average, 1 in Sardonyx is a combination of two different varieties of chalcedony in distinct layers. The stone's main red and brown portions are sard (a reddish-brown chalcedony), and the white and black bands are made of onyx. Forming through sedimentary processes in volcanic rock cavities. Due to sardonyx’s color and banding, it is sometimes called carnelian onyx.
