Ring Clock, this LED-based, battery-powered watch does what it says, and allows you to wear a piece of jewelry that tells the time, it is designed by Gusztav Szikszai. It started as a design concept for the Moving Innovation challenge held by CGSociety, which challenged entrants to visualise a design that could be possible to produce and use 10 years in the future. The ring comprises of independently moving parts, an inner section which is in contact with your finger, and an outer section which can be rotated.
On this outer section are three rows of numbers which denote the time in hours, minutes and seconds through the use of orange or blue LEDs. Gusztav hopes that future versions of the Ring Clock might be able to avoid batteries by taking advantage of the rotational kinetic energy required to activate the ring and harnessing it to power the LED lights.