A calcium carbonate bowl

the apple-green color derived from nickel silicate inclusions

For the collector who prefers the crystal as found rather than cut—the rough form reveals beryl's natural hexagonal habit

or altar—wherever it will catch the light

reflection

Peridot Faceted Sterling Silver Heart Ring Courage A calcium carbonate bowlThe color is olivine greenthe specific shade that forms forty miles below the surface and comes out unchanged. Peridot is the gem quality variety of olivine ((Mg,Fe)2SiO4), a mineral that crystallizes in the Earth's upper mantle under high pressure and temperature. Its vivid yellow green is produced by iron in the crystal structurean intrinsic color that no post formation process alters. This faceted stone is cut into a heart shape and set in solid .