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Peridot, often called olivine and chrysolite, is a gem variety occurring in the solid solution series between fosterite (Mg2SiO4) and fayalite (Fe2SiO4). The members of this most common solid solution series of the olivine group are the primary crystallization products of silica-poor but magnesium and iron-rich magmas. Olivine frequently coexists with plagioclase and pyroxenes in igneous rocks. Magnetite, corundum, chromite and serpentine are its associates in crystalline dolomitic limestone formations. It readily alters to serpentine minerals, such as antigorite, and to talc, limonite and hematite..... (2003) Complete Story
Lets Talk Gemstones - Zircon is the single member of the zircon group of the nesosilicates that is suitable for use as a gemstone. In the nesosilicates, independent SiO4 tetrahedra are connected only by ionic bonds. Because the tetrahedra are not linked to form chains.... (2002) Complete Story
Richly colored morganite gems are among the more valuable of the secondary gemstones. The value of morganite has increased with the expanding knowledge of the gem-buying public. The more informed consumers become about gemstones, the more it fuels the growing demand for colored gems. Freeform gems, carvings, and new faceted designs join the popular and traditional step-cut rectangle with truncated corners and are appearing in displays more frequently. Beryl's combination of desirable physical properties and its many color choices make the variety of morganite a gem suitable for all types of jewelry..... (2003) Complete Story
This is a report on the largest occurrence of Tourmaline in the history of Brazil gem mining; the Morro Redound Tourmaline of the State of Minas Gerias Brazil. The material was first discovered in 1992 near the village of Morro Redondo, in the northeast of Minas Gerias.... (1997) Complete Story
Cleopatra was reported to have a fine collection of emerald jewelry, but rumor has it that it was really peridot. We hope she won't be too disappointed. Peridot was mined on an island in the Red Sea called Zebirget or St. John's Island, thousands of years ago. These peridot are a magnificent green color and truly deserved a place in royal jewelry.... (1999) Complete Story
