World's largest blue star sapphire - yours for $300m

Sri Lankan gem trader ready to sell rare egg-shaped gem weighing 1,404.49 carats A Sri Lankan gem trader who owns the world's largest blue star sapphire has decided to sell the stone for the dizzying asking price of $300m (£206m). The rare egg-shaped stone weighs 1,404.49 carats and has been authenticated as the biggest of its kind at the Gemological Institute of Colombo (GIC), a private laboratory in the Sri Lankan capital.