Citrine Restoration: Reshaping for Brilliance & Cost Estimate

Question
I have an 18 carat one stone citrine that has lost it's brilliance after my fiancee wore it constantly.  I was told that to restore it's luster that it would need to have the surfaces reshaved. Is this true and how much ( approximately ) would it cost?  Everything appears to be ok - it is surrounded by two carts of diamonds and all are intact.

Answer
Hi Tom,

Yes I re-polish stones all the time.  It would have to be removed from the mounting by a jeweler.  Then if you want send it to me for repolishing or someone like me who does this type of work.  It would cost 45.00 plus shipping.

Regards,
Steven Covey
Gemstone Cutting Services
sdcovey@msn.com