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Gemstone Chart
Natural Bixbite Natural Bixbite
Bixbite is a specific kind of emerald stone known as beryl which is also known as red beryl, red emerald or scarlet emerald.
Color: Pink, Red
Categories: semi-precious stone
Chemical Composition: Be3Al2(SiO3)6
Crystal Group: Hexagonal
Refractive Index: 1.577(+-.016), 1.583 (+-.017)
Hardness: 7.5
Density: 2.67-2.745
Occurrence: Utah, U.S.A.

Natural Chalcedony Natural Chalcedony
Chalcedony is a catch all term that includes many well known varieties of cryptocrystalline quartz gemstones. They are found in all 50 States, in many colors and color combinations, and in sedimentary, igneous, and metamorphic rocks.
Color: grayish, purple, white, green, blue, lavender, yellow, brown
Categories: semi-precious stone
Chemical Composition: SiO2
Crystal Group: Hexagonal
Refractive Index: 1.530 - 1.539
Hardness: 6.5
Density: 2.57 – 2.64
Occurrence: Brazil, U.S.A. Germany, India, Uruguay, Austarlia, Egypt, Italy, Scotland, South Africa, Namibia, Madagascar, Mexico, Tanzania, and many other localities throughout the world.

Natural Chrome Tourmaline 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 Chrysocolla Quartz Natural Chrysocolla Quartz
Chrysocolla quartz is chalcedony mixed with varying amounts of chrysocolla. The chrysocolla provides the robin's egg blue coloration, and the quartz provides sufficient hardness for use in jewelry.
Color: green, blue, white
Categories: semi-precious stone
Chemical Composition: SiO2
Crystal Group: Hexagonal
Refractive Index: 1.544 - 1.553
Hardness: 7
Density: 2.66
Occurrence: Arizona, Mexico

Natural Chrysoprase Natural Chrysoprase
Chrysoprase is a gemstone variety of chalcedony or cryptocrystalline quartz, colored by trace amounts of nickel.
Categories: semi-precious stone
Chemical Composition: SIO2
Crystal Group: Hexagonal
Refractive Index: 1.544 - 1.553
Hardness: 7
Density: 2.65 - 2.66
Occurrence: Australia, Tanzania

Natural Color Change Sapphire Natural Color Change Sapphire
A rare variety of sapphire, known as color changing sapphire, exhibits different colors in different light. A color change sapphire is blue in natural light, and violet in artificial light. A similar effect is also seen in alexandrite.
Color: Color changing blue to purple, greenish brown to red
Categories: semi-precious stone
Chemical Composition: AL22O3
Crystal Group: Hexagonal
Refractive Index: 1.759-1.778
Hardness: 9
Density: 4
Occurrence: Ceylon, East Africa

Natural Dioptase 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 – 1.709
Hardness: 5
Density: 3.28 – 3.55
Occurrence: Russia, Tsumeb Namibia, California and Colorado USA, Congo, Zaire, Chile

Natural Emerald Natural Emerald
Emerald, the green variety of the mineral beryl, is the most famous and favored green gemstone.The majority of the worlds gem quality Emeralds come from the Muzo area of Colombia.
Color: Blue, Green Blue
Categories: precious stone
Chemical Composition: Be3Al2(SiO3)6
Crystal Group: Hexagonal
Refractive Index: 1.577(+-.016), 1.583 (+-.017)
Hardness: 7.5-8
Density: 2.72 (-.05, +.12)
Occurrence: Brazil, Pakistan,Russia, East Africa, India, Madagascar, Columbia

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