Baume et Mercier Watch Riviera Automatic Rose Gold 10787. The Riviera 10787 features a satin-polished rose gold (750/1000) dodecagonal case paired with a transparent black sapphire dial. The proportions of this elegant timepiece show the perfect balance that Baume & Mercier always seeks: 39 mm in diameter and 9.6 mm in thickness. The sophistication of the polished and sun-satin rose gold (750/1000) bezel – fastened with four rose gold (750/1000) screws – extends to its free octagonal crown, also crafted in rose gold (750/1000) and adorned with the embossed black-lined brand emblem, the Phi logo.