At the heart of every atom sits its nucleus, and the Tsar Bomba Nucleus Femme 03 places a glittering core at the centre of its dial. Baguette-cut stones radiate outward like a burst of light, ringed by a circle of cubic zirconia, and sculpted rays carry the pattern to the edge of the tonneau. Rose-gold accents on the screws, hands and crown warm the design. In Blue, a sky-blue shell and strap frame the white face.

A Swiss Ronda quartz movement keeps the time, and luminous coating lets you read it after dark. At around 60 grams, the 35mm ceramic case rests weightlessly on your wrist beneath a sapphire crystal, water resistant to 50 meters (5 ATM). The fluororubber band changes without tools whenever you want a new look. Each glance comes back with a little sparkle.