The world's biggest blue star sapphire weighs 1404.49 carats.
(CNN)The world's biggest blue star sapphire — weighing in at 1,404.49 carats — has been found in a mine in Sri Lanka.
Gemologists in Colombo say the gem is worth at least $100 million, but could sell for up to $175 million.
Star sapphires get their name from the six-pointed star-shaped reflection that appears on their surface when they are polished.
According to local media, the gem was discovered last August in Ratnapura, a town in southern Sri Lanka known as the "City of Gems."
Updated 1557 GMT (2357 HKT) January 5, 2016