Peridot was known to the ancient Egyptians as "stone of the sun". Traditionally, its extraction was done at night when the natural shine of the stone was easier to see. It has a range of colors from yellow-green to intense grass-colored light green. It splits and deflects the light rays passing through it, conferring a velvety appearance and a slightly greasy luster. It is one of the two stones formed in the upper mantle (the other is diamond), and not in the earth's crust. It is also possible to find remains of peridotes in meteorites.