Tungsten carbide gets polished with diamonds. The carbon fibre will go before the rest of it.

I've had my carbide ring for 4 years now, no scratches anywhere. Like the other guys said, 5 min. and I had my ring all picked out, it was the one on display, and the size was even perfect."thumbsup"
Good luck to you and her.
(I don't think anyone has married just there left hand before, he must look kinda freaky, left hand pretty and polished, and right one probably has fuzzy knuckles.:shock::razz