Yep, those indeed are the three gems.  Good job!  Unfortunately, your work isn't quite over just yet.$B$BNo, I'm not trying to pull a fast one here, silly $C.  This is about making magic jewelry - Talvash del Kissel quality-level jewelry!  You need a strong power source to give it some oomph.  Well, that necklace has no more oomph to give.