Carnelian (early: cornelean ) is already used in the Stone Age to make beads. Pebbles of the reddish orange gemstone might be polished by...

Myth and mystery surround the natural green cube of nephrite found at Hattusa. A Bronze Age capital of the Hatti and Hittite Empires,...

Turquoise is beloved for thousands of years by people from royals to the richly challenged. The world's first known turquoise mine is...

Obsidian is translucent volcanic glass, an igneous stone created from quickly cooled lava. It fractures with clean sharp edges. For...

Asteria or Star Stones create a star-like inner glow. Star sapphires belong to this group. In the ancient world they're valued by Greeks...

Abundant in native form, sulfur (sulphur) is a mysterious and essential component of natural life. All living things contain sulfur. It...