Check out the iNecklace, which is actually a piece of jewelry that you could replicate if you really want to, but you can also buy one if you’d rather not make one yourself. The unique part of this piece is that it pulsates, kind of like what the LEDs on a Mac do.
It’s made out of CNC-machined aluminum with an LED inside which pulsates for up to 72 hours at a time. Each of the necklaces contains a tiny circuit board to make it work. The pendant is silver. It’s the perfect geek gift for yourself or your significant other.