| Gemstone Chart |
 Natural Chrome Tourmaline
Chrome tourmaline is a beautiful bottle-green variety of the gemstone. Gem-quality chrome tourmaline is quite pricey and is found in East Africa.
Color: dark green, light green, yellowish green
Categories: semi-precious stone
Chemical Composition: (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31
Crystal Group: Hexagonal
Refractive Index: 1.624(+.005, -.005) - 1.644(+.006, -.006)
Hardness: 7-7.5
Density: 3.06 (.05, +.15)
Occurrence: East Africa
|  Natural Diopside
Diopside is a common mineral and is found worldwide. Diopside has several varieties, including a chromium-rich gem variety called chrome diopside.
Color: pale bluish green or dark blue green, brownish green or dark blue green. yellowish green or yellow bluish green.
Categories: semi-precious stone
Chemical Composition: CaMgSi2O6
Crystal Group: Monoclinic
Refractive Index: 1.665 - 1.730
Hardness: 6
Density: 3.25 - 3.55
|  Natural Dioptase
Dioptase is an intense emerald-green to bluish-green copper cyclosilicate mineral.Dioptase is a rather unusual gemstone that will rarely be found in your basic jewelry stores. It is a beautiful gemstone with a very unusual combination of green colors.
Color: Dark blue green, emerald green, or turquoise
Categories: semi-precious stone
Chemical Composition: CuSiO2(OH) 2
Crystal Group: Hexagonal
Refractive Index: RI 1.644 ¨C 1.709
Hardness: 5
Density: 3.28 ¨C 3.55
Occurrence: Russia, Tsumeb Namibia, California and Colorado USA, Congo, Zaire, Chile
|  Natural Euclase
Euclase is a rare mineral, resembling beryl in color and hardness.Euclase is found in granitic pegmatites with other gem minerals such as topaz and beryl.
Color: White, pale blue, greenish blue, dark blue.
Categories: semi-precious stone
Chemical Composition: BeAlSiO4(OH)
Crystal Group: Monoclinic
Refractive Index: 1.652-1.672
Hardness: 7.5
Density: 3.18
Occurrence: Brazil, Tanzania, Russia, Zimbabwe, Madagascar, Austria.
|  Natural Hemimorphite
Hemimorphite is a usually white or colorless mineral, essentially Zn4Si2O7(OH)2¡¤H2O, an important ore of zinc. Also called calamine.
Color: Light blue, dark blue, green ,white.
Categories: semi-precious stone
Chemical Composition: (Zn4Si2O7(OH)2.H2O)
Crystal Group: Orthorhombic
Refractive Index: 1.612-1.633
Hardness: 5
Density: 3.44
Occurrence: Franklin and Sterling Hill New Jersey, New Mexico, Montana, Arizona, U.S.A; Congo; Nerchinak in Transbaikalia, Siberia; Zambia; Santa Eulalia and Mapimi, Mexico; England; Wenshan, Yunnan Province, China.
|  Natural Iolite
Iolite is a popular and interesting gemstone, and is the gem variety of the mineral cordierite.It has also been called water sapphire because it looks very much like a blue sapphire.
Color: violet, blue, dark blue,
Categories: semi-precious stone
Chemical Composition: MG2AL4SI5O18
Crystal Group: Orthorhombic
Refractive Index: 1.53 - 1.55
Hardness: 7 - 7.5
Density: 2.57 - 2.66
Occurrence: Sri Lanka; Burma; India; Tsivory,Madagascar; Canada; Namibia; Tanzania; Norway; U.S.A.; Brazil
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