By Gold bars of course!!!
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You can buy them at the Grand Exchange. Although, it is preffered that you mine iron ore and smelt the ore into bars to raise your mining and smithing level and earn you profit.
a sapphire from an uncut sapphire by using a chisle on it, and smelt a gold bar into a sapphire necklace.
Copper, to make Bronze.
If you have the sufficent mining level to mine gold, then find a gold ore and smelt it into a gold bar. Grab a ring mold from players, the ge, or a local shop. When done, use the ring mold and the gold bar on the furnace, and choose the option to make a gold ring.
Buy gold bars and a ring mold, and then you can create gold rings. (crafting exp.) You will also need a furnace to use the mold on on.