Peridotite from Mont Briançon, Haute-Loire, France. Comes with certificate of authenticity. Type of stone: Peridotite. Dominant color: multicolored. Origin: France. Average weight (Carats): 406.1 carats. Dimensions (mm): 57 x 45 x 26 mm. Ref. : SKU025536. Igneous rocks rich in iron and magnesium, poor in silica, such as peridotite and dunite, often from the Earth's mantle.