If you want more of a shine, you could try something like tung oil. You apply it, let it dry, then wipe off the excess and lightly buff with a cloth. Rinse, repeat and with some care and patience, you will end up with a mirror polish. Its a bit harder to pull off with the bolsters. You'd need them to also be mirror or else it will be very hard to get the transition looking good.
I think the handle is looking good now! Most fine polished handles will end up matte wth some use.
One thing to think about next time you use mosaic pins is to think ahead, mark and when you insert them, make sure the mosaic patterns are symmetrical with both pins identical to one another.
Looks great!