Worlds Most Expensive Gemstone

One of the rarest gems in the world, a flawless blue diamond, has sold for £4 million at a Sotheby's auction in Hong Kong.

This makes it the most expensive gemstone in the world, per carat, sold at auction.

After intense bidding, the 6.04 carat, internally flawless blue diamond fetched £650,000 per carat.

The price smashed a 20-year-old record held by the Hancock Red - a red diamond which fetched £450,000 per carat at the time



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