Sri Lanka unearths 300 kg plus giant natural blue sapphire
Sri Lankan authorities displayed perhaps the world’s largest natural corundum blue sapphire, weighing 310 kilograms, which was found in a gem pit about three months ago. Local gemologists, who have examined the sapphire, said it was one of the rarest gems in the world as it weighed more than 300 kilograms. International organizations are yet […]
