So after spending a bunch of gil to get my Goldsmithing up I spent a bunch more hunting down some +3 Bone Chips to create some rings from. Took a long time but managed to make several +2 and a few +3 versions. But upon comparison I realized something...

The +2 and +3 versions add in no added benefits that a +1 doesn't already give. No extra defense, magic defense, or evasion. All that time/effort wasted for nothing. I'm hoping maybe this is just a glitch or there's a hidden bonus to using high quality versions beyond the standard +1. Bone rings are really the only useful rings up the stat rings that DoM classes can use.