Gemstone Chart |
Natural Agate Agate is a beautiful natural chalcedony stone, classified as a semi precious gem and has been used by people as early as the ancient Egyptians in and before 3000 BC! Agate is hard and tough enough to be incorporated into jewelry and other ornamental items. Color: Blue, green, yellow,orange, brown, gray Categories: semi-precious stone Chemical Composition: SiO2 Crystal Group: Hexagonal Refractive Index: 1.530 - 1.539 Hardness: 6.5 - 7 Density: 2.57 - 2.64 Occurrence: Scotland, U.S.A., India, England, Italy, Brazil, Uruguay, Germany, Egypt, Indonesia, and many other localities.
| Natural Bi Color Tourmaline Bi color tourmaline is the name given to tourmaline which displays more than one color in the same cystal.It is classified as a semi-precious stone. Color: Green, red, yellow, orange. Brown, green, pink 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, Brazil, USA, Afghanistan, Nigeria, Madagascar
| 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 Clinohumite Clinohumite is a rare mineral and an especially rare gemstone. It is a member of the humite group of minerals, which includes humite, clinohumite, chondrodite, and norbergite.Only two sources of gem-quality material are known: the Pamir Mountains of Tajikistan, and the Taymyr region of northern Siberia. Color: Brown, yellow, white, orange, or reddish brown Categories: semi-precious stone Chemical Composition: Magnesium Silicate Fluoride OH Crystal Group: Monoclinic Refractive Index: 1.625 ¨C 1.668 Hardness: 6 - 6.5 Density: 3.17 - 3.35 Occurrence: Extremely rare - gem quality found only in the Pamir Mountains, Tadzhikistan. Other mineralogical occurrences include, Mt. Vesuvius, Italy; Pargas, Finland; Llanos de Juanar, Malaga, Spain; Tilly Foster Mine, New York; Fort Defiance, Apache County, Arizona; Crestmore Quarry, Riverside County and Lower Lake, Fresno County, California; Luna, New Mexico and Franklin, New Jersey, USA.
| 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 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 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 ¨C 2.78+ Occurrence: China, Japan
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