The Ronde Solo preserves the perfectly pitched classical elegance and signature Cartier features of the Ronde de Cartier watch that serves as its inspiration: Roman numerals, blue sword-shaped hands, winding mechanism crowned with a sapphire and rail-track minute circle..Case in 18K rose gold and steel, 18K rose gold beaded crown set with a synthetic spinel cabochon. Sapphire crystal, silvered opaline dial, 12 Roman numerals, blued-steel sword-shaped hands. Semi-matt brown alligator leather strap, 18K rose gold ardillon buckle. Self-winding mechanical movement with calibre Cartier 049, calendar aperture at 3 o'clock, water-resistant to 3 bars (30 metres/100 feet).Case dimensions: 42 mm diameter, 8. 36 mm thick.