This ring is built of a bell knob from an electric guitar that is attached to a sterling sliver ring. The main thought behind this amazing ring is to "turn down the suck if you hate something, or crank it up if it is amazing". The volume knob actually turns (although don't be disappointed that it actually doesn't change the volume).
The ring is made in a neutral colour so it fits with most things you will wear. It measures .5 inches tall which is rather on the large side. The actual ring can be custom built if you provide the measurements (takes about three weeks to have built).
Check out the full details over at Etsy.