| Mineral | Tourmaline | 
|---|---|
| Chemistry | A(D3)G6(T6O18)(BO3)3X3Z | 
| Color | Vivid Red | 
| Refractive Index | 1.62 - 1.64 | 
| Birefringence | 0.018 - 0.040 | 
| Specific Gravity | 3.06 | 
| Mohs Hardness | 7.0 - 7.5 | 
7.03ct (RL1218)
7.28ct (RL1215)
5.12ct (RL1214)
5.82ct (RL1213)
4.21ct (RL1211)
9.08ct (RL1199)
10.85ct (RL1196)
11.09ct (RL1191)
12.61ct (RL1190)
22.73ct (RL1177)
43.65ct (RL1175)
2.76ct (RL1170)
2.05ct (RL1167)
3.53ct (RL1165)
2.08ct (RL1163)
5.67ct (RL1150)
1.83ct - 9x7mm (RL1146)
1.85ct - 9x7mm (RL1145)
2.76ct (RL1144)
2.48ct (RL1141)
3.63ct (RL1140)
3.12ct (RL1138)
7.50ct (RL1134)
3.93ct (RL1132)