Sphalerite (Blende), Pyrite, Siderite, Quartz from Mésage Mine, Saint-Pierre-de-Mésage, Vizille, Isère, Auvergne-Rhône-Alpes, France. Comes with certificate of authenticity Average Weight (Carats) : 15.61 ct Dimension (mm) : 23 x 20 x 15 mm Réf. : SKU022101