Blue and Purple Round Tanzanite from Tanzania

About Tanzanite

Tanzanite is the blue to violet variety of zoisite, a calcium aluminium silicate mineral. Its colour may range from pale blue and lavender to saturated violet-blue, often with subtle burgundy or brown tones. It is usually transparent and can show pleochroism: the colour appears to change when the stone is viewed from different directions. This optical effect is especially strong in tanzanite and influences how cutters orient…