Hi Clare,
If you want to make your own rings for chain maille, especially using heavier gauge wire, you really need to use a jeweller's saw, or a special cutting system. You can cut with flush cutters, but the ends will never match quite perfectly, and this can spoil the look of some weaves.
I use a koil kutter system, and love it, but this, or the more expensive jump ringer set, is a bit of an investment, especially with a tumbler to deburr and polish the rings too.
You can buy ready cut and tumbled rings in the right aspect ratios both here and in the US though.
hth
george
