Peridot is a gem-quality variety of the mineral olivine. It belongs to the forsterite-fayalite mineral series. Some even refer to peridot as 'olivine', but when it comes to the gemstone, 'peridot' is the correct term. Peridot is an idiochromatic gem, meaning its color comes from the basic chemical composition of the mineral itself and not from minor traces of impurities. Thus, peridot is found only in green. In fact, peridot is one of the few gemstones available that can be found only in one color, although the shades of green may vary from light yellowish to dark brownish-green.
Chalcedony is a demure crystal, subtle and mystic, cool and serene, ethereal yet solid. It has an inviting, softblue translucence, and an almost imperceptible movement within the stone that invokes a stillness of silent reverence. It's calming, and speaks of spirit and trust