The rainbow watch first surfaced in 2012 when Rolex set multi-colored sapphires into a limited-run Cosmograph Daytona. It has been around sporadically since then, but has rebounded as a full-fledged genre in the past few years.  The protocol for rainbow watches is to set gemstones into the bezel in a gradient colors that run from light to dark, with each color blending into the next one on the palette. The.. Read More