Tanzanite Earrings - A Delightful Purple Collection Tanzanite is a rare mineral, and the Simanjiro District in Tanzania's Manyara Region is the only place it has been discovered. The Mererani Hills are close to the mining area, which is only 7 kilometers long and 2 km broad. The intense trichroism (an optical phenomenon) that tanzanite exhibits, which causes it to show the colors blue, violet, and burgundy alternately, is well recognized. The alignment of the crystal is necessary for this color display. Additionally, it has been discovered that tanzanite's appearance changes according to illumination. Blue is reported to be more noticeable in fluorescent lighting, while violet is considered more prominent when viewed in incandescent lighting