Triangle cut tanzanite gemstone high quality blue stones

✦ Gemstones ✦   Tanzanite     Tanzanite is a member of the Zoisite family and is known for its exceptional trichroism, meaning it can display three different colors depending on the angle it is viewed.   The most desirable tanzanite displays a vivid blue to purplish-blue hue, which is usually achieved through heat treatment, which enhances the gem's natural color by removing brownish or yellowish tones.   In terms of hardness, tanzanite ranks between 6.5 and 7 on the Mohs scale. While it's not as hard as diamond or sapphire, it's still durable enough to be used in most types of jewelry as long as it's handled with care. Tanzanite has a specific gravity of 3.35 and a refractive index between 1.69 and 1.70, which gives it a bright shine and sparkle.   The main use of tanzanite is in fine jewelry. Its striking bluish-purple color and rarity make it a popular choice for a variety of jewelry, including rings, necklaces, earrings, and bracelets.  …

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