For each of these four 30-piece limited editions of the Premier Precious, Harry Winston travelled to Ravenna, in Italy, a town renowned the world over for its mosaics. This latest chapter in the brand's exploration of artistic crafts spotlights glass micromosaic. Tiny fragments of translucent and opaque glass are affixed by hand to the dial to create unique geometric patterns. Diamonds are carefully incorporated into the design to accentuate the vibrant colours of the glass. More diamonds sparkle on the bezel and lugs of the white or pink gold case, which houses an automatic movement delivering a generous 72 hours of power reserve courtesy of a skeletonised oscillating weight in pink gold.