Or if you are a low level char for example high level Hell difficulty gems sell for dirt cheap, far cheaper then crafting them, and with no level restrictions you can put them on low level character. Spend 500g on a couple of socketed items at lvl 15 and put in a couple of Square Rubys, voila you have lvl 30 equiv dps at lvl 15 for next to nothing, everything just melts away.
This is a really smart idea. I just started a monk in hardcore - they have a separate stash and gold pool. First thing I did was just outright buy a couple solid rare fist weapons. I'm pretty sure they're both socketed, too. Will totally pick up some gems for 'em. Cuz, y'know. Hardcore.