Cosmograph Daytona JHV necklace featuring a yellow gold

necklace featuring a yellow gold puff heart charm

John Hardy necklace featuring surf-inspired sterling silver links

alloys most commonly used in high-technology and in the aerospace and chemical industries

necklace featuring a round disc adorned with pave diamonds on a white gold chain

Cosmograph Daytona JHV necklace featuring a yellow goldThe tachymetric scale A key part of the model's identity is the bezel moulded with a tachymetric scale for measuring average speeds of up to 400 miles or kilometres per hour. Blending high technology with sleek aesthetics, the black bezel is reminiscent of the 1965 model that was fitted with a black Plexiglas bezel insert. The monobloc Cerachrom bezel in high tech ceramic offers a number of advantages: it is corrosion resistant, virtually scratchproof