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Many types of precious stones belonging to groups or species that share a common crystal structure, if not a common chemical composition. Not all varieties of precious stones belonging to a group. Many large stones such as peridot, zircon, topaz and spinel, are varieties that are not unique properties shared with another type of jewel. Here are some of the best known groups of precious stones:. Beryl species is famous for its most notable, emerald. But the family also includes beryl aquamarine, Morganite, golden beryl bixbite. All are beryl beryllium aluminum silicate, and a hardness of 7. 5 to 8 on the Mohs scale. The species has two corundum gems the most important colors: ruby zoisite ring ??and sapphire. Known for their excellent hardness (9 on the Mohs scale) and the rarity of ruby zoisite ring ??and sapphire from both a common chemical composition (aluminum oxide) and a crystal structure (trigonal). The main difference is the color: red ruby zoisite ring ??corundum, while all other colors of corundum are classified as sapphire. Feldspar is nearly 60% of the crust. Feldspar is a group of minerals characterized by the presence of aluminum and silica in their ion chemistry. There are two main subgroups of feldspar producing gem-quality materials: potassium feldspar and plagioclase, which is a series of calcium for sodium feldspar. Among the Well-Known feldspar gemstones are moonstone, orthoclase, Amazonite, Andesine, Sunstone and labradorite. Amazonite, Moonstone and orthoclase are potassium feldspars all. THEY Have a hardness of 6 to 6. 5 on the Mohs scale, and a vitreous luster. The garnets are a large group of Differently colored minerals with similar crystal structure and related chemical compositions. Garnet Historically Been Highly Regarded HAS ITS for very good hardness (7-7. 5 on the Mohs scale) and great brilliance. The garnet family includes the inexpensive red garnets, almandine and pyrope, as well as Some rarer varieties. The premium garnets include the red-orange Spessartite, Tsavorite and Demantoid the green, and the purple-red rhodolite. Jade has-been Known and treasured for years More than 7. 000. But only in 1863 was it discovered that the jade is in fact not a single mineral. What was traditionally known as jade is actually two distinct minerals: jadeite and nephrite. Nephritis is the most common form of jade. nephritis ranges in color from dark green to mid-green or gray, but it can also be white, yellowish or reddish. Nephrite is slightly softer than jadeite, nephrite is from 6 to 6. 5 on the Mohs scale, while jadeite is 6. 5-7. They have very different chemical compositions as follows: nephritis is an iron magnesium calcium silicate, while jadeite is a silicate of sodium aluminum. Both minerals also have different densities. Jadeite has a density of 3. 30 to 3. 38 while the nephritis is less dense at 2. 90 to 3. 03. Quartz Is The Second MOST common mineral on earth, making up about 12% of the earth's crust. Only the feldspar is more common. There are Two different branches of the quartz family. Includes quartz crystal rock Macrocrystalline, amethyst, citrine, smoky quartz, rose quartz and tiger's eye. Macrocrystalline quartz, as the name suggests, large crystals HAS Which Can Be distinguished by the naked eye. This type of transparent quartz IS Mainly to translucent, with vitreous luster has. The other type of quartz is known as cryptocrystalline quartz. It under the microscope (or submicroscopically) of small crystals and is usually translucent to opaque with a waxy or greasy luster to dull. The tourmaline group includes a number of species and varieties. Some tourmaline are named according to their color, including achroite (colorless), dravite (yellow-brown to dark brown), Indicolite (blue), rubellite (red), schorl (black), and watermelon (pink / red green and white). Mineralogy distinguishes a number of species of tourmaline according to their chemical composition, including elbaite and liddicoatite. The name of this group of gems may be obscure, but one type of ruby zoisite ring is one of the most popular gems of our time, tanzanite. There are actually three members of the gemstone ruby zoisite ring species: tanzanite, and thulite anyolite. By their chemical composition, is a ruby zoisite ring aluminum calcium silicate with a hardness of 6. 5 to 7 on the Mohs scale. Thulite is opaque, huge variety of ruby zoisite ring rich in manganese which is pink. It was discovered in Norway in 1820 and named after the mythical island of Thule. Thulite is usually cut into cabochon or carving ornamental objects. Anyolite was first discovered near Longido in Tanzania in 1954. Although considered a variety of zoisite, strictly speaking, it is a metamorphic rock composed of intergrown green zoisite, hornblende black and ruby. When choosing engagement rings, there are many factors you should consider. These factors go well beyond the budget and can make the difference between engagement rings . . Its becoming a very competitive with everyone trying to find their own "brand" of diamonds and jewelry and design, the so-called Calla Cut is nothing more than a stone . . Many people who trade in diamonds does not realize that the way you manage your diamonds and diamond jewelry can actually impact the business of jewelry. But . . There is an old saying "Diamonds are a girl's best friend" (although most girls are hardly on good terms with the price), and a new best friend was typing . . The mention of any diamonds usually triggers thoughts of glamor and romance. Diamonds have become fairly standard for engagement rings. Shining accessories differ from their materials to their craft production. Of course we all want our accessories to be brilliant and long lasting. Accessories may be brilliant, but they are more care qualities. And as for the qualities, Tiffany accessories are high quality of their looks bright. Other accessories from other manufacturers or even without a brand could never match the quality is Tiffany. We all know that choosing something Tiffany: an assurance of quality. It not only means that Tiffany could provide various types of accessories brilliant, but also means that Tiffany accessories are delicate and complex quality. . . .