To make gem tiped bolts, first smith some unfeathered bolts from metal bars, then atach feathers to them. you have made regular bolts. to make them have gem tips, get any uncut gem (sapphire, emerald, ruby...) and use a chisel on it to cut it. If you use the chisel with the cut gem again, you'll have an option to cut it into bolt tips. Once you have the gem tips, use them with the bolts and you'll have gem tiped bolts 8-) ps: if you are not able to cut uncut gems, because your crafting lvl isn't high enough, you must buy cut gems instead -.-