Breguet Marine Haute Joaillerie White Gold — Ruby Posidonia Dial | Ref. 9509BB/5R/984/RD0R

Where the emerald Posidonia dazzles with the cool luminosity of deep ocean water, the ruby iteration of the Marine 9509 Haute Joaillerie burns with the incandescent warmth of underwater sunlight filtered through coral. Reference 9509BB/5R/984/RD0R deploys 85 baguette-cut rubies, coloured sapphires and diamonds across a mother-of-pearl ground to recreate the Posidonia oceanica seagrass meadows that inspired the design — each stone individually selected, oriented and set by hand over countless hours of bench work in Breguet's Le Sentier atelier.

The 35.8 mm white gold case presents the same jewelled architecture as its emerald counterpart: baguette-cut diamond end pieces, a briolette-cut diamond crown, and a baguette-cut gem bezel that encircles the composition in a frame of white light. Within the sapphire caseback, calibre 591C performs its self-winding duties with 38 hours of power reserve — a movement worthy of study in its own right, even when the dial demands all available attention. At 10.46 mm thick, the case carries its jewelled weight with surprising discretion.

The black leather strap grounds the fiery dial palette in a depth of shadow that heightens the rubies' chromatic intensity, a pairing as considered as any element of the design. Priced at $215,440, the 9509BB/5R is among the most technically demanding and visually spectacular creations in the contemporary Breguet catalogue — a piece that demonstrates, as the maison has been demonstrating since 1775, that the art of the watchmaker and the art of the jeweller are not separate disciplines but a single continuous tradition of excellence.