Kyanite 3-5mm Graduated Faceted Rondelle - 15-16 Inch Supplies-Resources-Tools-Pliers-Cutters highly prized for jewelry

highly prized for jewelry

Black Opal is a naturally occurring variety of precious opal mined in Australia

gray and white

In its purest form

It is a particularly unusual gem because it exhibits a special optical property known as tenebrescence

Kyanite 3-5mm Graduated Faceted Rondelle - 15-16 Inch Supplies-Resources-Tools-Pliers-Cutters highly prized for jewelryKyanite 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