Their cutters spent six months transforming the stone into a 110.3-carat, pear-shaped gem, the largest known yellow diamond in the world. The Cora Sundrop was exhibited at the Natural History ...

The world's rarest gemstone is made of kyawthuite, a transparent reddish-orange mineral that’s known from just one sample ...

The Righteous Gemstones kicked off its fourth and final season with an origin story episode to end all origin story episodes as the HBO comedy explored the early beginnings of the Gemstone family ...