Quartz from Rivoirands, Vizille, Isère, Auvergne-Rhône-Alpes, France. Comes with certificate of authenticity. Stone type: Quartz. Dominant color: multicolored. Origin: France. Average weight (Carats): 915.0 carats. Dimensions (mm): 115 x 47 x 58 mm. Ref. : SKU021251. Silicon dioxide (SiO2) mineral formed under various geological conditions. Widely used in jewelry for its diversity of colors and its hardness.