| Mineral | Tourmaline (Dravite) |
|---|---|
| Chemistry | NaMg3Cr6Si6O18(BO3)3(OH)3OH |
| Color | Green - Vivid Green |
| Refractive Index | 1.624 - 1.644 |
| Birefringence | 0.018 - 0.040 |
| Specific Gravity | 3.06 |
| Mohs Hardness | 7.0 - 7.5 |
1.63ct (CT0291)
1.63ct - 8mm (CT0287)
2.98ct (CT0283)
2.04ct (CT0282)
2.20ct (CT0278)
2.06ct (CT0277)
1.51ct - 6mm (CT0274)
1.82ct (CT0271)
6.16ct (CT0269)
4.31ct (CT0257)
2.51ct (CT0252)
4.15ct (CT0246)
3.04ct (CT0245)
2.68ct - 10x8mm (CT0243)
5.28ct (CT0242)
4.01ct (CT0232)
5.82ct (CT0225)
4.27ct (CT0212)
4.44ct (CT0201)
2.36ct (CT0197)
4.35ct (CT0189)
15.14ct - 16x14mm (CT0167)
2.00ct (CT0160)
12.15ct (CT0144)