Opal
The Opal was considered in Greek and Roman times to be the symbol of hope and purity. As an amulet, it was used to protect its wearer against disease.
- Hardness: 5-6.5
- Refractive Index: 1.45
- Requires special care; avoid heat and chemicals
The Opal was considered in Greek and Roman times to be the symbol of hope and purity. As an amulet, it was used to protect its wearer against disease.