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
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