Is there an Apple iRing in the future?
The ring could also be used as a wireless controller for games, and remotely activate a camera's shutter. It also would be able to wirelessly move a cursor around a computer screen. Despite the size of the device, Apple envisions putting a fingerprint scanner on the ring in order for it to work with mobile payment service Apple Pay. Another variation of the ring mentioned in the filing, includes a camera. The actual name of Apple's patent application is "Devices and Methods for a Ring Computing Device."
Since the application is not for a design patent, any such device might not look exactly like the images in the application. Keep in mind that a start-up company called Ringly already offers smart jewelry, including a ring, that vibrates and flashes colors to notify the wearer of a incoming phone call or text message on a paired smartphone.
source: USPTO via IBT