Only discovered as of 2016, this giant blue star sapphire has blown the previous largest sapphires out of the water. Gemologists in Sri Lanka have certified that the gem weighs 1404.49 carats and is valued up to $300 million.

The Star of Adam is privately owned and was discovered in the Ratnapura region of Sri Lanka, known as the Land of Gems for the sheer volume of gem-quality sapphires that have come from that area.