The hardest natural material — pure carbon locked in a cubic lattice

One of Earth's most abundant minerals — the crystal in your watch and your windowsill

The mineral family that gives us emerald, aquamarine, and morganite

A brilliant gemstone prized for its golden and blue hues

The oldest mineral on Earth — crystals found in Australia are over 4 billion years old

The deep red garnet — a classic gemstone worn since ancient times

The sky-blue gemstone treasured by ancient Egyptians and Native Americans

A green-to-orange garnet gemstone — January's birthstone in crystalline form

The deep red garnet variety found in volcanic rocks and some meteorites