August Birthstone:The Peridot
Peridot is the modern August birthstone and the gem designated for the 16th wedding anniversary. Peridot (pronounced pair-a-dot) is a transparent yellowish-green Magnesium/Iron Silicate. It is a gem variety of the mineral Chrysolite or Olivine and its chemical formula is given by: (Mg,Fe)2SiO4. Peridot ranges in color from light yellow-green to the intense bright green of new spring grass to olive. Because of the way peridot splits and bends the rays of light passing through it, it has a velvety appearance, a rich glow, and a slightly greasy luster. The purer green a peridot is the higher the value. Any tinges of brown or visible flaws greatly diminish the price. The best-colored peridot has an iron percentage of less than 15% and includes nickel and chromium as trace elements. It is not clear whether the word peridot comes from the Arabic word faridat, which means gem or if it is derived from the French word peritot which means unclear. The French were the first to call this...