Livestream Alvor (Algarve), Portugal: HD Beachcam Praia do Alvor Tanzanite Faceted Roundel Beads 5mm Blue 7 Bead(s). Tanzanite Faceted Roundel Beads for Jewelry Making These faceted roundel Tanzanite beads will be great for earrings and to add sparkle to those pendants you make. The beads are a beautiful blue violet depending on how the light hits them. Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate), caused by small amounts of vanadium.[3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Tanzania, in a very small mining area (approximately 7 km (4. 3 mi) long and 2 km (1. 2 mi) wide)[4] near the Mererani Hills.[5] Tanzanite is noted for its remarkably strong trichroism, appearing alternately blue, violet and burgundy depending on crystal orientation.[6] Tanzanite can also appear differently when viewed under different lighting conditions. The blues appear more evident when subjected to fluorescent light and the violet hues can be seen readily when viewed under incandescent illumination. In its rough state tanzanite is colored a reddish brown to clear, and it requires heat treatment to remove the brownish "veil" and bring out the blue violet of the stone.[7] The gemstone was given the name 'tanzanite' by Tiffany & Co. after Tanzania, the country in which it was discovered. The scientific name of "blue violet zoisite" was not thought to be sufficiently consumer friendly by Tiffany's marketing department, who introduced it to the market in 1968. In 2002, the American Gem Trade Association chose tanzanite as a December birthstone, the first change to their birthstone list since 1912. Quantity: 7 Bead(s) Material Type: Tanzanite Size: 5mm Color: Blue Legend: Tanzanite is commonly believed to facilitate a higher consciousness and stimulate intuition and perception. Origin: TANZANIA NOTE: Images do not reflect number and size. Please see table for that information.