Gemstone of the Day: Onyx
Thursday, November 29th, 2007It’s definitely time to start writing Gemstone of the Day articles again, and I thought I’d begin with a fairly well-known gemstone: onyx.
Onyx is a cryptocrystalline form of quartz. It occurs in pretty much any color you can imagine, and it is commonly banded. Onyx with red banding is called sardonyx. Solid black onyx is […]

