15 january, 2026 48939628 algt colored stone identification report identification species ................................................................................ natural zoisite variety ............................................................................................ tanzanite description shape & cutting style ...................... modified octagon, step cut total carat weight .................................................................. 5.13 carat color ........................................................................ intense purplish blue transparency ......................................................................... transparent additional grading characteristics origin ................................................................................................ tanzania origin determination is an expert opinion based on microscopic examination, spectroscopic features and chemical trace element analysis. comments total 6 stones. average carat weight: 0.85 ct. tanzanite is commonly heated at low temperature to improve its color. there is currently no scientific method available to determine whether this gemstone has been enhanced or not.