I agree with the others, it would help to know exactly what you did with the wire before anyone can tell you what gauge to use.
Did you braid the wire, make wire wrapped links.....
If you have a picture or better description of what you did to make it, we can all help further. We would all love to see anyway!
A heavier gauge wire probably won't break on you unless it's over worked and becomes brittle.
I did find a guide the other day online for wire gauges and their best uses- let me see if I can find it again for you. Otherwise with more info I'm sure the bunch of us here can help you :)