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Your ring seems to be marked 18ct gold.
That means that it is 75% gold.
Because the price if 18ct gold is around £30 per gramme, the ring will only be worth the value of the gold. It has no stones to increase the value.
So if(For example) you have 7g of gold then the ring would sell as scrap for just over £200.
5g would of course be about £150
Hope that helps. Greg