Multi Tourmaline 3mm Faceted Round - 15 Inch 40x60mm Indigo gabbro is a color

Indigo gabbro is a color variant of the igneous mineral

Treated quartz that results in a unique blue color

It has been called the Earth Rainbow due to its concentric bands displaying virtually every color the earth can produce

It's often found in large masses and can be colorless

followed by a mild heat treatment gives it the bright yellow color

Multi Tourmaline 3mm Faceted Round - 15 Inch 40x60mm Indigo gabbro is a colorTourmaline is classified as a semiprecious stone and occurs in a vast array of colors, everything from colorless to black, from pastel to bright to dark. It can even exhibit various colors within the same specimen. Its name derives from the Sinhalese word turamali, which translates to stone of many colors. Due to this variety of colors, Tourmaline has often been confused with other stones. Many stones in the Russian crown jewels from the 17th century