algt colored stone identification report identification species ................................................................................ natural zoisite variety ............................................................................................ tanzanite description shape & cutting style ........................................... round, mixed cut 15 December, 2025 65979951 total carat weight .................................................................. 5.32 carat color ....................................................... light to 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 20 stones. average carat weight: 0.26 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.