Catherine was seen wearing Asprey London 167 Button Necklace first time in 2006. Since then we have seen the necklace many times. Inspired by the buttons employed in traditional English tailoring, the 167 Button features in several Asprey collections. With a centre stone surrounded by pave set stones, the flagship 167 New Bond Street address is engraved around the edge of the design. This Asprey signature design sparkles is available in 18ct yellow, rose and white gold with a choice of precious stones. Catherine owns the necklace in in white gold that costs $4,250.