A gem company in Sri Lanka has unveiled a rare and massive gemstone weighing 683 pounds (310 kilograms) that has been certified as one of the biggest corundums ever found in the country. Sri Lanka's National Gem and Jewelry Authority says it has done a series of gemological tests on five samples taken from the rock. “To our knowledge this specimen is indeed a rare specimen and not recorded in the geological literature,” read an authentication letter given by the authority to the owners who unveiled the stone on Sunday. When the outer layer was removed for inspection, the interior showed a silky blue patchy appearance, the letter said, suggesting the stone is a blue sapphire.
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Sri Lanka company prepares to sell massive blue gemstone
