Sri Lanka’s National Gem and Jewelry Authority says it has done a series of gemological tests on five samples taken from the rock.

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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.

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.

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.

Sri Lanka’s National Gem and Jewelry Authority says it has done a series of gemological tests on five samples taken from the rock.

Sri Lanka's National Gem and Jewelry Authority says it has done a series of gemological tests on five samples taken from the rock.