its coloring is the result of the chemical reaction that occurs when copper is introduced to water
green and yellow with white and gray inclusions
Cubic Zirconia can be truly colorless
It is extremely fracture to resistant and has been used for blades and other tools since Neolithic times
Green Kyanite 6-8x12-25mm Drop - 15-16 Inch latest-chips its coloring is the resultKyanite 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