Tanzanite, a rare and mesmerizing blue-violet gemstone, is celebrated for its metaphysical properties. Untreated Tanzanite, in its natural state, is highly sought after for its unique color and origin. Found exclusively in the Merelani Hills of northern Tanzania, this untreated gemstone is prized for its rarity and natural beauty, making it a valuable addition to the world of gemstones and jewelry. Collectors and enthusiasts particularly covet high-quality, untreated Tanzanite, as it commands premium prices in the market. Natural Tanzanite Crystals: 12 pieces Total Weight: 152,2 ct / 30,45 gr Crystals Weight: from 8 ct to 18,9 ct Gem Type: 100% Natural Tanzanite Shape: Irregular Color: As Picture Clarity: As Picture Origin: Tanzania, Merelani Hills Treatment none at all Hardness: 6.5-7.0 Refractive index: 1.69-1.70 Buyer will receive the Tanzanite crystals exactly as shown in the pictures. The images are professionally captured using lamp lighting, though variations in color perception may occur due to individual monitor settings and light sources. Close-up photographs allow buyers to examine the stones in detail, thanks to professional photographic equipment used for this purpose. It's important to note that the suggested health and spiritual properties associated with gemstones and minerals have no scientific basis, and Catawiki cannot guarantee or be held liable for these attributes. They are not considered a substitute for traditional medical treatment. Standard tracked shipping ( 7-20 days for Europe ) ( 15-40 days for rest of the world )