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Gemstones Propeties
 

Home Products Buyer's Guide

Gemstone Properties

Gemstone Specific Gravity Hardness Refractive Index
Alexandrite 3.71 - 2.75 8.5 1.74 - 1.75
Amazonite 2.5 6 - 6.5 1.52 - 1.54
Amber 1.05 - 1.07 2 - 2.5 1.54
Amethyst 2.64 - 2.66 7 1.54 - 1.55
Ametrine 2.64 - 2.68 7 1.54 - 1.55
Aquamarine 2.67 - 2.9 7.5 - 8 1.57 - 1.58
Chalcedony
   Agate 2.64 - 2.66 7 1.54 - 1.55
   Black Onyx 2.64 - 2.66 7 1.54 - 1.55
   Carnelian 2.64 - 2.66 7 1.54 - 1.55
   Jasper 2.64 - 2.66 7 1.54 - 1.55
   Chrysoprase 2.64 - 2.66 7 1.54 - 1.55
Chrysoberyl
   Cat's Eye 2.54 - 2.64 6.5 - 7 1.53 - 1.54
   Alexandrite (Yellow, Brown,  Green) 2.54 - 2.64 6.5 - 7 1.53 - 1.54
Coral
   Black 3.5 - 4 3.5 1.48 - 1.65
   White 3.5 - 4 3.5 1.48 - 1.65
   Pink 3.5 - 4 3.5 1.48 - 1.65
   Gold 3.5 - 4 3.5 1.48 - 1.65
  Red 3.5 - 4 3.5 1.48 - 1.65
Emerald 2.67 - 2.8 7.5 - 8 1.57 - 1.6
Garnet
   Almandite 3.95 - 4.25 7.25 - 7.5 1.78 - 1.83
   Demantoid 3.81 - 3.87 6.5 - 7 1.88 - 1.89
   Pyrope 3.51 - 3.8 7.25 1.71 - 1.75
   Rhodolite 3.8 - 3.95 7.25 1.75 - 1.78
   Tsavorite 3.57 - 3.64 7.25 1.74 - 1.76
Hematite 5.2 - 5.3 5.5 - 6.5 2.94 - 3.22
Iolite 2.56 - 2.66 7 - 7.5 1.53 - 1.58
Jade
   Jadeite 3.3 - 3.36 6.5 - 7 1.66 - 1.68
   Green, white & purple (Nephrite) 2.9 - 3.05 6 - 6.5 1.66 - 1.68
Lapis Lazuli 2.7 - 2.9 5 - 5.5 1.5
Malachite 3.6 - 4 3.5 - 4

1.65

Moonstone 2.54 - 2.63 6 - 6.5 1.52 - 1.54
Opal
   white & black 1.98 - 2.2 5.5 - 6.5 1.44 - 1.47
   Boulder 1.98 - 2.2 5.5 - 6.5 1.44 - 1.47
   Fire Opal 1.98 - 2.2 5.5 - 6.5 1.44 - 1.47
Pearl
   Natural 2.6 - 2.78 2.5 - 4.5 1.53 - 1.69
   Cultured 2.72 - 2.78 2.5 - 4.5 1.53 - 1.69
Peridot 3.27 - 3.45 6.5 - 7 1.64 - 1.69
Quartz
   Aventurine 2.64 - 2.66 7 1.54 - 1.55
   Citrine 2.64 - 2.66 7 1.54 - 1.55
   Rock Crystal 2.64 - 2.66 7 1.54 - 1.55
   Rose Quartz 2.64 - 2.66 7 1.54 - 1.55
   Smoky Quartz 2.64 - 2.66 7 1.54 - 1.55
   Tiger's eye 2.64 - 2.66 7 1.54 - 1.55
Rhodonite 3.74 - 3.94 7 - 7.5 1.65 - 1.69
Ruby 3.95 - 4.05 9 1.76 - 1.78
Sapphire 3.95 - 4.05 9 1.76 - 1.78
Spinel 3.57 - 3.63 8 1.71 - 1.73
Tanzanite 3.2 - 3.4 6 - 7 1.69 - 1.7
Topaz
   Blue 3.5 - 3.57 8 1.61 - 1.64
   Yellow/ Orange 3.5 - 3.57 8 1.61 - 1.64
Tourmaline
   Green, Blue 3 - 3.26 7 - 7.5 1.62 - 1.65
   Pink, Red 3 - 3.26 7 - 7.5 1.62 - 1.65
   Yellow/ Orange 3 - 3.26 7 - 7.5 1.62 - 1.65
   Bicolored 3 - 3.26 7 - 7.5 1.62 - 1.65
Turquoise 2.6 - 2.85 5 - 6 1.61 - 1.65
Zircon
   Blue 3.9 - 4.8 6 - 6.5 1.78 - 2.01
   Green 3.9 - 4.8 6 - 6.5 1.78 - 2.01
   Yellow 3.9 - 4.8 6 - 6.5 1.78 - 2.01
   Colorless 3.9 - 4.8 6 - 6.5 1.78 - 2.01

 

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Last modified: 07/27/08