Peridotite from Mont Briançon, Haute-Loire, France. Comes with certificate of authenticity. Type of stone: Peridotite. Dominant color: multicolored. Origin: France. Average weight (Carats): 877.7 carats. Dimensions (mm): 75 x 52 x 40 mm. Ref. : SKU025504. Igneous rocks rich in iron and magnesium, poor in silica, such as peridotite and dunite, often from the Earth's mantle.