
Ruby
Red corundum at bead grade: opaque, deep, and harder than every stone but diamond.
SPECIES
Corundum
HARDNESS
9 Mohs
CALIBRES
6 mm

Red corundum at bead grade: opaque, deep, and harder than every stone but diamond.
SPECIES
Corundum
HARDNESS
9 Mohs
CALIBRES
6 mm