Fossil Pseudogrammoceras Fallaciosum (late Toarcian - 178 MA) from Belmont-d'Azergues, Arrondissement of Villefranche-sur-Saône, Department of Rhône, Auvergne-Rhône-Alpes, France (1988). Comes with certificate of authenticity. Average weight (Carats): 3766.0 carats. Dimensions (mm): 135 x 97 x 30 mm. Ref. : SKU039903. A fossil is the mineralized trace of an ancient living organism, preserved in a sedimentary rock.