Quantity: 1 kilogram
Average size range: 4 to 7 millimeters
Peridot is the name used for gem-grade olivine, a mineral usually found in igneous rock and the upper mantle below the Earth’s crust. Peridot is one of very few gems that is only found in one color, in this case olive green. The specific shade of green depends on the amount of iron present in the crystalline matrix.