A watch boutonniere is a diminutive (roughly 15/16ths of an inch) timepiece sized to fit a buttonhole. This example by Aucoc is encircled by glittering rose-cut diamonds and displays a minute porcelain dial, masterfully crafted and ingeniously designed to fit right into the buttonhole of your lapel. The watch mechanism and winding stem are secured in a small case that sits behind the lapel.