Gemstone Chart |
Natural Iolite Iolite is a popular and interesting gemstone, and is the gem variety of the mineral cordierite.It has also been called water sapphire because it looks very much like a blue sapphire. Color: violet, blue, dark blue, Categories: semi-precious stone Chemical Composition: MG2AL4SI5O18 Crystal Group: Orthorhombic Refractive Index: 1.53 - 1.55 Hardness: 7 - 7.5 Density: 2.57 - 2.66 Occurrence: Sri Lanka; Burma; India; Tsivory,Madagascar; Canada; Namibia; Tanzania; Norway; U.S.A.; Brazil
| Natural Kunzite Kunzite is the pink to light purple gem variety of the mineral Spodumene.Although kunzite is a relatively soft and delicate gem, and can fade after prolonged exposure to light, its appealing color makes it a popular gem. Small gems are seldom cut from kunzite because of its cleavage and strong pleochroism. It is rarely seen in rings, necklaces, or any other forms of jewelry where small stones are required. Color: Pink, Lilac, Light Violet Categories: semi-precious stone Chemical Composition: LiAlSi2O6 Crystal Group: Monoclinic Refractive Index: 1.660 - 1.675 Hardness: 7 Density: 3.17 - 3.19 Occurrence: Africa, Brazil, Canada, Madagascar, Mexico, Myanmar, Afghanistan, Sweden, and USA (California).
| Natural Morganite Morganite is a rare, pink semi-precious gemstone of the beryl family of minerals. With pink a fashion favorite, morganite is a gem that is much in demand. It has a dazzling brilliance and soft color that ranges from clear pink to a lovely peach. Color: Pink - Champagne Categories: semi-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, Madagascar
| Natural Opal Opal is the most colorful of all gems. It is a form of silica chemically similar to quartz, but more like glass and containing a variable amount of water within the mineral structure. Its splendid play of color is unsurpassed, and fine examples can be more valuable than diamond. Precious opals (black and white) are cut and polished into cabochons and used in all forms of jewelry. Color: White, green, blue, black, red, orange, violet, pink, grey, yellow. Categories: precious stone Chemical Composition: SIO2nH2O Crystal Group: Amorphous Refractive Index: 1.44-1.46 Hardness: 5.5 - 6.0 Density: 2.65 - 3.00 Occurrence: Czechoslovakia, Mexico, Honduras, Australia, Brazil, Tanzania.
| Natural Phenakite phenakite is a fairly rare nesosilicate mineral consisting of beryllium orthosilicate, It is one of the brightest of the colorless gemstones.Madagascar seems to be the most important source for this rare stone. Color: White Categories: semi-precious stone Chemical Composition: Be2SiO4 Crystal Group: Hexagonal Refractive Index: 1.651-1.696 Hardness: 7.5-8.0 Density: 2.94--2.96 Occurrence: Russia, Madagascar, U.S.A., Brazil, France, Switzerland, Ceylon, E. Africa.
| Natural Rhodolite Rhodolite is a beautiful pink to violetish red garnet which was named after the rhododendron flower. Commercially rhodolite is one of the most important garnets. Rhodolite is quite available in small sizes which are relatively low in price. Very fine large rhodolite garnets are rare and are moderate in price. Color: red, purple-red Categories: semi-precious stone Chemical Composition: Al2(SiO4)3 Crystal Group: Cubic Refractive Index: 1.75 - 1.77 Hardness: 7.25 Density: 3.74 - 3.94 Occurrence: Brazil, East Africa, Ceylon, India, Madagascar, Zimbabwe
| Natural Rubelite The rubellite is a particularly beautiful gemstone from the colourful family of the tourmalines. Its colour shines in the most beautiful nuances from red to shocking pink. Rubelite is rich in lithium and free of magnesium and iron. Color: Hot Pink to Intense red 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: Brazil, Madagascar, Nigeria, U.S.A.
| Natural Scapolite Scapolite is actually the name of a series between the sodium chloride rich mineral called marialite and the calcium carbonate rich mineral meionite.Scapolite was originally discovered in 1913 in the Mogok Stone Tract in upper Burma (Myanmar). Scapolite is a rare and little known gemstone. It is a beautiful gem that comes in many colors. Color: white, yellow, violet,pink Categories: semi-precious stone Chemical Composition: Na4Al3Si9O24Cl /CA4Al6Si6O24CO3 Crystal Group: Tetragonal Refractive Index: 1.54 - 1.577 Hardness: 6 Density: 2.6-2.71 Occurrence: Kenya, Mozambique, Madagascar, Burma, Brazil, Canada.
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