Gemstone Chart |
Natural Chrysoberyl The Chrysoberyl family is best known for the more valuable alexandrite and catseye varieties. Faceted chrysoberyl is a beautiful gem which is not as well known in its own right. Apart from the high hardness, it takes a good polish and has a good luster. Color: yellow, green, color changing, red, blue-green, greenish-yellow or brown Categories: semi-precious stone Chemical Composition: BeAl2O4 Crystal Group: Orthorhombic Refractive Index: 1.741 - 1.760 Hardness: 8.5 Density: 3.73 Occurrence: Ceylon, Tanzania, Russia, Madagascar, Brazil.
| 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 Demantoid The demantoid is one of the most brilliant gemstones that exist, yet until recently it was little known except among collectors and gemstone lovers. Color: Green, yellow green. Categories: semi-precious stone Chemical Composition: Ca3Fe2(SiO4)3 Crystal Group: Cubic Refractive Index: 1.888 - 1.889 Hardness: 6.5 Density: 3.82 - 3.50 Occurrence: Russia, Namibia, Iran, South 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 – 1.709 Hardness: 5 Density: 3.28 – 3.55 Occurrence: Russia, Tsumeb Namibia, California and Colorado USA, Congo, Zaire, Chile
| Natural Enstatite Enstatite is a relatively common mineral, but is rarely used for jewelry purposes. It is generally cut for gem connoisseurs and collectors rather than for the common consumer. Color: Gray, green, brown, orange-brown, yellowish-brown, colorless, pale yellow. Categories: semi-precious stone Chemical Composition: MgSiO3 Crystal Group: Orthorhombic Refractive Index: 1.663-1.673 Hardness: 5.5 Density: 3.26-3.28 Occurrence: South Africa, Burma, Tanzania, Sri Lanka, Kenya, Germany, Norway, Greenland
| Natural Fire Agate Fire Agate is a variety of agate containing inclusions of goethite or limonite, it is a layered stone. The layers are small enough that light entering them forms interference colors known as "fire." Color: Orange, green, purple, Red, blue, peacock Categories: semi-precious stone Chemical Composition: SiO2 Crystal Group: Trigonal Refractive Index: 1.544 - 1.553 Hardness: 7 Density: 2.65 Occurrence: Central Mexico, Arizona USA
| Natural Fluorite Fluorite has a wide range of colors including yellow, blue, pink purple and green. It is an interesting and beautiful gemstone. Color: Colorless, yellow, brown, green, blue, violet, pink Categories: semi-precious stone Chemical Composition: CaF2 Crystal Group: Cubic Refractive Index: 1.43 Hardness: 4 Density: 3.18 Occurrence: Namibia, U.K., Switzerland, Nigeria, Czechoslovakia, Canada, Poland, Italy, Norway, Germany, U.S.A.
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