(IDEX Online) - Has Rihanna started a new trend, with a $700,000 Jacob & Co diamond watch on a neck choker?It certainly provoked a reaction at the Louis Vuitton Fashion Show, in Paris, even if it ignored one very basic requirement for wearing a timepiece.The Barbadian singer, 35, was involved in the design, adapting the Brilliant Flying Tourbillon watch to be worn on a black calfskin choker, stamped with an alligator-leather pattern.The watch itself is white gold, set with 338 baguette white diamonds and one cabochon-cut diamond, with a total weight of 30.04 ct.In preparation for the fashion event, Rihanna decided she would wear a timepiece in a completely different way," said Jacob & Co on its website."She came to Jacob & Co. with the concept, like she had many times before. That relationship goes back over a decade. She and Jacob Arabo would often discuss the jewelry she would wear."Jacob & Co observes elsewhere on its website that it "developed the Brilliant collection for the woman who appreciates technical watchmaking, while at the same time wants something beautiful to adorn her wrist." Pix courtesy Jacob & Co