Comparison Charts

Our Gems vs Natural Gems

 Ramaura™ Cultured RubyNatural RubyNicholas Created AlexandriteNatural AlexandriteEmpress Cultured EmeraldNatural Emerald
Hardness9.09.08.58.587.5 - 8
Specific Gravity3.96 - 4.003.96 - 4.003.753.70 - 3.722.65 - 2.672.67 - 2.78
MineralCorundumCorundumChrysoberylChrysoberylBerylBeryl
Crystal SystemHexagonalHexagonalOrthorhombicOrthorhombicHexagonalHexagonal
CompositionAl2O3+Cr+3Al2O3+Cr+3BeAl2O4+Cr+3BeAl2O4+Cr+3Be3Al2Si6O18+Cr+3Be3Al2Si6O18+Cr+3
Refractive Index1.760 - 1.7701.760 - 1.7701.746 - 1.7561.744 - 1.7551.561 - 1.5651.565 - 1.582
Birefringence0.0080.0080.0100.0110.003 - 0.0050.005 - 0.009

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