musgravite-minGranted all the gemstones on this list are rare but musgravite is exceptionally rare. For many years after its 1967 discovery in South Australia’s Musgrave Range, there were only eight known musgravite stones in the world. Since then small quantities of musgravite have popped up in Greenland, Antarctica, Sri Lanka, Madagascar and Tanzania but that hasn’t increased its availability. Musgravite remains exceedingly scarce and incredibly expensive, running roughly $35,000 per carat.

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