Save this article to read it later. Find this story in your account’s ‘Saved for Later’ section. Until recently, I only thought of carnelian as the stone in the Hellenistic relics at the Metropolitan ...

Part of The “New” Issue of The Highlight, our home for ambitious stories that explain our world. Carnelian has many faces. When it’s brittle and a darker shade of red, it’s known as sard. When it’s ...