The truth to be told, I'd rather have the charms again, not the gemstones. Gemstones were in Diablo 2, if there will be in DD, people will call it "rip-off".
Items-on-demand are interesting, I mean if you gather dragonscales and such... It was used in several games before so I wish Larian would make it more original... Like if you order a weapon, you can name it yourself(every good weapon need a name).