A natural form of volcanic glass, treat as glass, taking care when setting not to crack the stone.
With a hardness of 5-5.5, fair to good toughness and good stability, obsidian is suitable for use in rings, pendants, earrings, bracelets, brooches and cufflinks, although abrasion and wear may occur in rings and bracelets.
Hardness – resistance to scratching and wear
Stability – resistance to alteration by light, heat or chemicals
Toughness – resistance to fracture, cleavage or cracking
Please note you will receive the stone in the photograph