Solitaire Necklace Last but not least is the one that’ll never go out of fashion - a solitaire necklace. In fact, this is the type of necklace that can look both minimalist and maximalist at the same time. A solitaire blue tanzanite necklace with a four-prong setting looks streets ahead of other necklaces. The reason why you should choose a four-prong setting is that it secures the centerstone in its place while highlighting its brilliance and fire. The Bottom Line So, these were the top 5 blue tanzanite necklace designs that can uplift your look. Tanzanite is a beautiful sturdy gemstone that you can wear every day. So, what are you waiting for? Pick a design that you love and start fashioning the necklace of your dreams now!