Top 10 Rarest Gemstones When we think of precious stones, diamonds, emeralds and rubies jump to mind as the most valuable gemstones in the world. However (or perhaps surprisingly), there are so many gemstones that are even more rare and, in turn, even more valuable. Check out these ten incredibly rare and insanely expensive gems below. 10. Tanzanite This striking blueish-purple stone is found exclusively in the Merelani foothills of Mount Kilimanjaro in Tanzania. Because of the remote and singular location, there is serious concern the world’s supply of tanzanite may be depleted in the next 20 years. And with great rarity, comes a greater price at $600- $1,000 per carat. 9. Taaffeite Austrian geologist Count Edward Charles Richard Taaffe is credited with discovering taaffeite, after happening across it while sifting through a box of similarly colored Sri Lankan spinel gemstones. Since this initial finding in 1945, only a handful of taaffeite stones have ever been fou...
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