While a typical curved bar necklace features a basic bar of metal, you can also add some style to it by embellishing the horizontal bar with small tanzanite gemstones. A curved bar blue tanzanite necklace will make you look not only stylish but also bold. This is the type of necklace you wear to a lavish party. Gemstone Medallion Medallions have an irresistible appeal to them. Worn since antiquity, medallions are prized for their unique flattened circular shapes of metal that make the wearer look nothing short of royalty. That’s the reason why gemstone medallions are the third on our list of top 5 blue tanzanite necklace designs.