Top 10 rarest gemstones in the world

The Top 10 Rarest Gemstones on the planet. The accompanying are world's novel, costly and most significant gemstones.

 1. Tanzanite

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                                                                                  Tanzanite is the blue and violet variety of the mineral zoisite belonging to the epidote group. The gemstone was discovered by Jumanne Ngoma in the Merelani Hills of Manyara Region in Northern Tanzania in 1967, near the city of Arusha and Mount Kilimanjaro. Tanzanite is only found in Tanzania, in a very small mining area. 

2. Pink Star Diamond 

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Estimated value‎: ‎US$83.2 million.

3. Grandidierite

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Grandidierite is an extremely rare mineral and gem that was first discovered in 1902 in southern Madagascar. The mineral was named in honor of French explorer Alfred Grandidier (1836–1912) who studied the natural history of Madagascar.

4. Poudretteite 

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Poudretteite is an extremely rare mineral and gemstone that was first discovered as minute crystals in Mont St. Hilaire, Quebec, Canada, during the 1960s. Estimated value‎ : $3,000 per carat.

5. Benitoite

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Benitoite is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite. Benitoite fluoresces under short wave ultraviolet light, appearing bright blue to bluish white in color. Current prices are on average $3,000 per carat. Smaller carat sizes come out to an average of $700 per carat; the cost per carat rises dramatically according to its size since one carat or above gemstones are rare.

6. Alexandrite  

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Alexandrite Gemstone is a rare variety of the mineral Chrysoberyl & is a strongly pleochroic gem. Color-changing alexandrite is nature's magic trick.Alexandrite is the highly regarded color changing variety of Chrysoberyl. The color of Alexandrite changes under different lighting conditions. If viewed in daylight, its color is greenish blue to dark yellow-green. If viewed in incandescent or candle light, its color is pink to red.

However, the vast majority of alexandrites are under one carat. You can see this reflected in our Price Guide. In sizes up to one carat, top-quality natural gems sell for $15,000. Over one carat, the prices range from $50,000 to $70,000 per carat.

 7. Musgravite 

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8. Painite 

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Painite is a very rare borate mineral. It was first found in Myanmar by British mineralogist and gem dealer Arthur C.D. Pain in the 1950s.

For decades, problems in Myanmar prevented more than a handful of samples from being discovered, but today more than 1,000 crystals are known to exist. Prices of up to $60,000 per carat were quoted for painite at the Tucson Gem Showcase.

9. Red Beryl

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The annual yield of red beryl from the mine is only about 5,000 to 7,000 carats a year. GMI is marketing the product as "red emerald," and touts it as one of the rarest gemstones in the world. Prices run as high as $10,000 per carat for top specimens. Most red beryl specimens are under one carat. 

10. Jadeite 

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The finest-quality jadeite almost transparent with a vibrant emerald-green color is known as “Imperial jade.” The royal court of China once had a standing order for all available material of this kind, and it's one of the world's most expensive gems.The record price for a single piece of jadeite jewelry was set at the November 1997 Christie's Hong Kong sale: Lot 1843, the “Doubly Fortunate” necklace of 27 approximately 15 mm jadeite beads, sold for US$9.3 million.