I was told it's roughly a 30 % markup but it might have been increased since. Maybe you might consider buying a regular Love and go to a goldsmith who can do the job for you aftermarket. Once I did some research and found the gems to be a few 100 USD all together ... plus the labor of course. Okay, it's not original any longer but you also could chose the gems; e.g. all rubins or blue sapphires.
(Interestingly my SO Cintrée didn't have any markup to the regular price)
(Interestingly my SO Cintrée didn't have any markup to the regular price)