Tanzanite exists in one place on Earth: the Merelani Hills below Kilimanjaro. This blue-violet zoisite, trichroic and velvet-deep, went from discovery (1967) to icon in a single generation — and its sole-source geology makes long-term rarity a mathematical certainty. Hardness 6–7, best in pendants, earrings and protected rings.Every tanzanite at GEMIC Institute is natural, certified by our accredited gemologists in Siem Reap, and filmed for its listing. Unique gems; worldwide tracked shipping with our 30-day inspection period.