You can use the spell "telekinetic grab". This is not a big money-maker; it takes a while for the gold to respwan. Mining clay (for example) will get you money much faster.
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There are easier ways to make money than that. Do fishing.
Selling runescape gold in the real world is illegal. You can "sell" runescape gold in-game for other items on the gran exchange locatedin the north-west corner of Varrock.
Since Runescape is a game, it doesn't really matter whether it was stolen or not. The price remains the same either way.I suggest you sell at the Grand Exchange, located at Varrock. When you're at the Varrock west bank, head north. You'll get there.
It is at bunches of places. Like the Al Kharid mining spot, or the Varrock West-bank basement (telekinetic grab only!).See the Related Link for more information.
I have the impression that mining clay is better, especially if you mine south-west of Varrock and use a teleport to get to the Varrock bank quickly. But I suggest you try several alternatives - see how much you get on a trip, and how long it takes you. Then convert the different alternatives to coins per hour or coins per minute. If you use a teleport, don't forget to subtract the law rune from your profit.