This black tourmaline is definitely one to show off in your collection!
Tourmaline is one of the birthstones for October. It is the name of a large group of boron silicate minerals, which share common crystal structure. However, despite the similarity in physical properties, tourmaline occurs in a broad range of colors.
Size: 2.75 x 1.13 x .75 inches
Weight: ~ 3 oz.