ITEM NAME:Blue Tanzanite Unheated 12mm Top Round Shape AAAA+ Loose Gemstones Jewellery Blue 12mm Tanzanite Unheated Top Round Shape AAAA+Loose Gemstones Zircon SPECIFICATIONS.(Blue 12mm Tanzanite Unheated Top Round Shape AAAA+Loose Gemstones Zircon. Clarity: AAAA+. Suitable for: Jewellery processing of rings, necklaces, bracelets, etc. Shape: Round. Color: Blue. 3) Wide range of use.