Well I found 2:

Theres this one (but you got to imagine the jewel is black) [img]http://www.myprecious.us/images/fullsize/hbt-17_(not_in_sunlight).jpg[/img]







And theres this one (no, don't make it look like a necklace but as a pin) [img]http://img.td-imgs.com/images/04/49/200449_1296558_NAF-200449.jpg[/img]


[@Ryu]