Gemstone Chart |
Natural Citrine Citrine is any quartz crystal or cluster that is yellow or orange in color. Although often cut as a gemstone, citrine is actually somewhat rare in nature. Color: Yellow, orange Categories: semi-precious stone Chemical Composition: SiO2 Crystal Group: Trigonal Refractive Index: 1.544-1.553 Hardness: 7 Occurrence: Brazil, Uruguay, Mexico, Russia, USA.
| Natural Eudialyte eudialyte is a rare, plummy-red stone. Eudialyte's name comes from the Greek words "eu" and "dialytos", meaning "easy to dissolve" which refers to the mineral's solubility in acids.The stone's distinctive grey, black or white patterning gives each piece of jewelry a unique beauty. Color: orange red Categories: semi-precious stone Crystal Group: Trigonal Refractive Index: 1.596 - 1.602 Hardness: 5 - 6 Density: 2.88 Occurrence: Sweden; Kippaw,Canada
| 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 Pezzottaite Pezzottaite is a raspberry-red to pink member of the Beryl Group named after Dr. Federico Pezzotta. Discovered in Madagascar and IMA approved in 2003. It is one of the great new gem discoveries of the last 20 years. Categories: semi-precious stone Crystal Group: Trigonal Refractive Index: 1.604 - 1.615 Density: 3.1 Occurrence: Madagascar, Afghanistan
| Natural Quartz Quartz is the most common mineral on the face of the Earth. It is found in nearly every geological environment and is at least a component of almost every rock type.There are many different varieties of quartz, several of which are semi-precious gemstones. Categories: semi-precious stone Chemical Composition: SiO2 Crystal Group: Trigonal Refractive Index: 1.544 - 1.553 Hardness: 7 Density: 2.65
| Natural Rhodochrosite Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. The pink color of rhodochrosite is caused by the element manganese and it is formed when manganese is dissolved by ground water and combines with a carbonate material and then drips off the ceiling of caves and crevices deep underground.Rhodochrosite often forms pink and white bands. It is often carved into figurines or boxes while the tubular stalactite formations are often sliced for use in jewelry. Fine gem quality crystals are sometimes cut into gemstones for use in high end jewelry, but the more common grade is used extensively in silver and gold jewelry. Color: Rose red, raspberry red, pink, grey, fawn, brown Categories: semi-precious stone Chemical Composition: MnCO3 Crystal Group: Trigonal Refractive Index: 1.600 ¨C 1.820 Hardness: 4 Density: 3.45 ¨C 3.70 Occurrence: Argentina; Colorado, U.S.A.; Romania; Hungary; India; South Africa; Saxony, Chile; Peru; Mexico.
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