minimum 4.25ct 11x11mm trillion tanzanite. tanzanite was discovered in 1967 making it relatively new to the gem world. it has a unique color that only ceylon sapphire and iolite come close to matching. tanzanite is a 6.5 on the moh's scale so loose stones and jewelry need to be treated with special care to prevent damage. tanzanite is only found in one place in the world tanzania. the continued availability is uncertain which makes it a great investment stone.
