RAW 52/31 - Black Tourmaline in Quartz

Here's a ring where I used a quartz that has black tourmaline inclusions.    According to Wikipedia, Tourmaline is a crystal boron silicate mineral compounded with elements such as aluminum, iron, magnesium, sodium, lithium, or potassium. You can see the roughly triangular outline of the elongated crystal structure.

Tourmaline in Quartz Ring