Daily Specials. Onyx is a cryptocrystalline form of quartz. The colors of its bands range from white to almost every color (save some shades, such as purple or blue). We have fine Onyx Countertops at wholesale pricing. Commonly, specimens of onyx available contain bands of colors of white, tan, and brown.Sardonyx is a variant in which the colored bands are sard (shades of red) rather than black. Pure black onyx is common, and perhaps the most famous variety, but not as common as onyx with banded colors. 1  Onyx Apricot Lace.2  Onyx Aqua Marina. 3  Ony Arco Iris. 4  Onyx Avion Gold. 5  Onyx Blue.ardonyx is a variant in which the colored bands are sard (shades of red) rather than black. Pure black onyx is common, and perhaps the most famous variety, but not as common as onyx with banded colors. 1  Onyx Apricot Lace. 2  Onyx Aqua Marina. 3  Ony Arco Iris. 4  Onyx Avion Gold. 5  Onyx Blue.