Peridotite from Mont Briançon, Haute-Loire, France. Comes with certificate of authenticity. Type of stone: Peridotite. Dominant color: multicolored. Origin: France. Average weight (Carats): 255.9 carats. Dimensions (mm): 39 x 25 x 25 mm. Ref. : SKU025513. Igneous rocks rich in iron and magnesium, poor in silica, such as peridotite and dunite, often from the Earth's mantle.