The Ballon Bleu de Cartier has been a favourite Cartier timepiece since its introduction in 2007, branching out in varying styles and colours. Though two things have remained constant through this time, the blue cabochon mounted on the crown and the spherical “balloon" shape of the case. Bar 12 o’clock the hours are set with 11 brilliant-cut diamonds that shine against the 18-carat rose-gold casing. It’s a watch destined to give any ensemble a glimmering lift (no air required). Cartier 18ct rose-gold, diamond, sapphire and leather watch Style no: WE902028 Materials: 18ct rose-gold round case 11 brilliant-cut diamonds totalling 0.09 carats Sapphire cabochon Technical Details: Pin-buckle fastening Case diameter 33mm Mechanical movement with automatic winding 12-zone flinqué dial with lacquered silvered sunray effect straight indices Roman numeral at 12 o’clock Branding at 12 o’clock blued-steel sword-shaped hours and minutes hands Two alternative satin-effect leather straps Water resistant to 30 meters