Gemstone - Amethyst
Chemical Composition:Si O2
Hardness: 7
Refractive Index: 1.54 - 1.55
Specific Gravity: 2.65
Lustre: Vitreous.
Locations Where Found:Global
Colours: Wide variety of colours.
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Gemstone - Aquamarine
Chemical Composition:Be3 Al2 (Si O3)6
Hardness: 7.75 - 8
Refractive Index: 1.57 - 1.58
Specific Gravity: 2.70
Lustre: Vitreous.
Locations Where Found:Brazil, USA, Sri-Lanka, Madagascar.
Colours: Light Blue, Pale Greenish Blue.
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Gemstone - Blue Sapphire
Chemical Composition:Al2O3
Hardness: 9
Refractive Index: 1.76 - 1.77
Specific Gravity: 4.00
Lustre: Vitreous.
Locations Where Found:Sri-Lanka, Thailand, Madagascar, Pakistan, Australia.
Colours: Blue
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Gemstone - Citrine
Chemical Composition:Si O2
Hardness: 7
Refractive Index: 1.54 - 1.55
Specific Gravity: 2.65
Lustre: Vitreous.
Locations Where Found:Global
Colours: Wide variety of colours.
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Gemstone - Emerald
Chemical Composition:Be3 Al2 (Si O3)6
Hardness: 7.75
Refractive Index: 1.57 - 1.58
Specific Gravity: 2.65 - 2.76
Lustre: Vitreous.
Locations Where Found:Columbia, Russia, Egypt, Brazil,
Pakistan.
Colours: Green.
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Gemstone - Opal
Chemical Composition:(Si O2 x H2O) Amorphous Silica Gel.
Hardness: 5.5 - 6.5
Refractive Index: 1.45
Specific Gravity: 2.1
Lustre: Sub-Vitreous to Resinous.
Locations Where Found:Hungary, Australia, Mexico, Nevada.
Colours: White, Black, Green, Pink, orange, Red.
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Gemstone - Peridot
Chemical Composition:(Mg, Fe)2 Si O4
Hardness: 6.5 - 7
Refractive Index: 1.66 - 1.70
Specific Gravity: 3.34
Lustre: Oily.
Locations Where Found:Burma, Australia, Norway, St. John's Isle.
Colours: Greenish Yellow, Green, Brown.
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Gemstone - Pink Sapphire
Chemical Composition:Al203
Hardness: 9
Refractive Index: 1.76 - 1.77
Specific Gravity: 4.00
Lustre: Vitreous.
Locations Where Found:Sri-Lanka, Thailand, Madagascar, Pakistan, Australia.
Colours: Pink
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Gemstone - Ruby
Chemical Composition:Al2O3
Hardness: 9
Refractive Index: 1.76 - 1.77
Specific Gravity: 3.99
Lustre: Vitreous.
Locations Where Found:Burma, Thailand, Sri-Lanka, Australia.
Colours: Red, Pink.
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Gemstone - Tanzanite
Chemical Composition:Ca2 Al3 (Si O4)3 (OH)
Hardness: 6 - 7
Refractive Index: 1.69 - 1.70
Specific Gravity: 3.35
Lustre: Vitreous.
Locations Where Found:Tanzania.
Colours: Blue, Violet.
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Gemstone - Topaz
Chemical Composition:Al2 (F,OH)2 SiO4
Hardness: 8
Refractive Index: 1.61 - 1.62
Specific Gravity: 3.54
Lustre: Vitreous.
Locations Where Found:Russia, Brazil, Siberia, Sri-Lanka.
Colours: Colourless, Blue, Yellow, Yellowish Brown, Pink.
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Gemstone - Tourmaline
Chemical Composition:(Na, Ca) (Li, Mg, Fe, Al)9 B3Si6 (O1OH)31
Hardness: 7 - 7.5
Refractive Index: 1.62 - 1.64
Specific Gravity: 3.06
Lustre: Vitreous, Resinous.
Locations Where Found:Russia, Brazil, Sri-Lanka.
Colours: Red, Green, Blue, Yellow, Black, Brown, Colourless, Party Coloured.
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Gemstone - Yellow Sapphire
Chemical Composition:Al2O3
Hardness: 9
Refractive Index: 1.76 - 1.77
Specific Gravity: 4.00
Lustre: Vitreous.
Locations Where Found:Sri-Lanka, Thailand, Madagascar, Pakistan, Australia.
Colours: Yellow
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