Gemstone Chart |
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 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 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 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 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.
| Natural Freshwater Pearl Freshwater pearls are a kind of pearl that comes from freshwater mussels.Freshwater pearls come in many shapes from round to button shapes, from flat flakes to rice shapes and in many colors. As with the salt water Akoya pearl the round shapes are generally more expensive. Color: orange, pink, white, gray, light purple, rose, black, brown, gold, yellow, silvery, green, blue, bronze. Categories: semi-precious stone Chemical Composition: CaCO3 Crystal Group: Not applicable Hardness: 3.5 - 4.0 Density: 2.66 – 2.78+ Occurrence: China, Japan
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