Unheated Tanzanite Crystal – Tanzania – Natural Blue Violet Zoisite Specimen 5.80ctA beautiful natural unheated tanzanite crystal from Tanzania displaying rich violet blue coloration with strong internal color zoning and excellent transparency. This crystal features a sharp natural termination and distinct pleochroic color shifts ranging from violet to blue depending on the viewing angle and lighting. Unlike heated material commonly seen on the market, this specimen retains its natural crystal structure and original unheated color