Here you go Stacy, just for your friend!!! It would most definately need a custom setting.

http://www.am-diamonds.com/articles/fancy-shaped-diamonds/rising-star-fancy-cut-diamond.php

Or more traditional shapes with star centers:

http://www.israelidiamond.co.il/english/News.aspx?boneId=1319&objid=1042

http://www.alibaba.com/product/il1034833...ar_patent_.html

Or use regular shapes and make a star look from them:







Attachments
star diamond ring from alanpfulton.jpg