| Gemstone |
Chemistry Organization |
Mohs Hardness |
Specific Gravity |
Refractive Index |
Subrefractive Index |
Dispersion |
Reflection Rate |
Thermal Conduction |
| Quartz |
SiO2 |
7.0 |
2.66 |
1.544 |
1.553 |
0.013 |
4.63 |
Low |
| Spinel |
MgO.Al2O3 |
8.0 |
3.65 |
1.725 |
1.730 |
0.020 |
7.11 |
Low |
| Corundum |
Al2O3 |
9.0 |
4.00 |
1.770 |
1.762 |
0.018 |
7.67 |
Middle |
| YAG |
Y3Al5O12 |
8.5 |
4.57 |
1.832 |
- |
0.028 |
8.63 |
Low |
| GGG |
Gd3Ga5O12 |
6.5-7.0 |
7.05 |
2.030 |
- |
0.038 |
11.56 |
Low |
| Cubic Zirconia |
ZeO2 |
8.5 |
5.80 |
2.200 |
- |
0.060 |
14.06 |
Very Low |
| Lithium Tantale |
LiTaO3 |
5.5-6.0 |
7.45 |
2.220 |
- |
- |
14.36 |
Low |
| Lithium Niobate |
LiNbO3 |
5.5-6.0 |
4.64 |
2.300 |
2.210 |
0.120 |
14.87 |
Low |
| Strontium Titanaite |
SrTiO3 |
5.5-6.0 |
5.13 |
2.409 |
- |
0.190 |
17.08 |
Low |
| Diamond |
C |
10.0 |
3.52 |
2.417 |
- |
0.044 |
17.20 |
Very High |
| Moissanite |
SiC |
9.3 |
3.21 |
2.650 |
- |
0.104 |
20.44 |
High |
| Rutile |
TiO2 |
6.0-6.5 |
4.26 |
2.616 |
2.903 |
0.330 |
21.90 |
Low |
