About Peridot :-Peridot is a well-known and ancient gemstone, with jewelry pieces dating all the way back to the Pharaohs in Egypt. The gem variety of the mineral Olivine, it makes a lovely light green to olive-green gemstone. The intensity of color depends on the amount of iron present in a Peridot's chemical structure; the more iron it contains the deeper green it will be. The most desirable color of Peridot is deep olive-green with a slight yellowish tint. Deeper olive-green tones tend to be more valuable than lighter colored greens and yellowish-greens. The history of Peridot is intrinsically tied to the tiny Egyptian island of St. John (Zabargad) in the Red Sea, which was the one of the only ancient sources of gem Peridot. This deposit has been totally exhausted, though fairly significant deposits have since been discovered, especially since the 1990's.