The new watches from Piaget take the concept of an envelope that might conceal a love letter as their primary design concept. The Piaget Love Letter Limelight watches are compact envelopes that open to reveal a black or mother-of-pearl dial set with diamond markers. The envelopes come wraped in stingray leather or paved with diamonds that are set with either a ruby or a yellow diamond at the opening. There is also a jewelry line for valentines day that features freeform hearts in rubies or diamonds.

[via WatchLuxus]