As far as I know, model ripping from 3DS games has not yet been accomplished. However, with Pokémon X and Y out now, I'd like to request bag sprites of all the items in the games, including the Fairy Gem, which is index # 715, to be ripped.
I hate to tell you this, LDEJRuff, but it's currently impossible to rip sprites from 3DS games. Since true system is fairly new, it could take a while to get the emulation process just right. The same applies for any file extraction techniques.
This topic describes the situation better than I can. How about taking a look?
http://www.vg-resource.com/showthread.php?tid=23957