Ballon Bleu de Cartier watch jaeger-lecoultre delivering ±20 seconds per year

delivering ±20 seconds per year precision—the most accurate mainspring-driven watch in the world as of 2025

00ct blue sapphires set in 18k white gold

The Grand Seiko SBGW323G is a tribute to purity in both design and craftsmanship

sapphire crystal case back

Creation of these strands requires incredible skill

Ballon Bleu de Cartier watch jaeger-lecoultre delivering ±20 seconds per yearBallon Bleu de Cartier watch, 40 mm, manufacture mechanical movement with automatic winding, caliber 1847 MC. 750 1000 rose gold 750 1000 case, fluted crown set with a blue sapphire cabochon, silvered guilloch dial, blued steel sword shaped hands, sapphire crystal, interchangeable brown alligator leather strap, interchangeable 750 1000 rose gold 750 1000 deployant buckle, calendar aperture at 3 oclock. Thickness: 12. 4 mm. Water resistant up to 3 bar