Via Luxist, the Joaillerie 101 Manchette from Jaeger Le-Coultre. At first glance, I had assumed it to be a bracelet. And a very easy thing to do. But look closely, and you will see that this delightful little thing does actually tell the time. This 18k white gold bracelet is set with 576 diamonds, although a variation with 400 diamonds and 11 onyx cabochons is also available.

Mechanical manually wound movement. Jaeger-LeCoultre Calibre 101.