Great start up buisness idea. Make a rhinestone design layout with a Vision CNC Engraver (http://www.visionengravers.com/) or CNC Router (http://www.visionrouters.com/index.html). Then you can mass produce for profit. Check out the video below

http://www.visionrouters.com/videos/HowTo-RhinestonesVideo.html

Here is an image of the template we made with our engraving machine.
http://www.visionengravers.com/support/tutorials/rhinestone/images/Fig2.jpg