The websites are pure scams. You are near a big city so you are in luck. I can give you the long answer or the short answer. You will get more money, the more motivated you are and the more educated you make yourself. You need to understand what karat you have and what % gold that is. You need to know what weight you have and what weight of pure gold that is. You need to know what a gram of pure gold is worth in London (about $37). You need to be looking for about 85% of that amount for the amount of pure gold you have. In any city there are lots of pawn shops and jewelers paying 40% to 60%. They all sell to one or two big recyclers that you can sell to also. I am going to guess it will be someone like www.mimrecycles.com or www.alphametalsrecycle.com To cut through the cra* just call and ask what they are paying per gram for whatever karat you have. Go with the highest one obviously.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra