Green Kyanite 5x10-20mm Top Drill Teeth - 15-16 Inch Stone Type_Shattuckite It may also contain rainbow-colored

It may also contain rainbow-colored or sparkling inclusions

Many stones in the Russian crown jewels from the 17th century which were thought to be rubies are actually red Tourmaline

Labradorite is remarkable for the way its aggregate layers refract light

The inner layer of the shell is composed of nacre (mother-of-pearl)

a mineralogist and jeweler

Green Kyanite 5x10-20mm Top Drill Teeth - 15-16 Inch Stone Type_Shattuckite It may also contain rainbow-coloredKyanite often occurs as long, bladed, striated crystals, transparent or translucent with a pearly luster. An aluminum silicate mineral, it may appear in white, pink, yellow, orange, green, blue, gray and black. In addition to its value as a gemstone, Kyanite is also extremely useful in industrial applications due to its high heat resistance. It is often used in kiln furniture and foundry molds, as well as for brake shoes, grinding wheels and cutting