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What is the micron thickness of Gold-filled metal?

Hi.. I am thinking of purchasing a gold filled item and was told that the thickness of gold used on GF is 50 to 100 times thicker than plating. However, I need to know, generally, how thick (in terms of microns) is the gold layer on gold filled jewellery? Thanks in advance.

Update:

Thanks Patrick. Yes, I read up on that article and it was very helpful but I need to know the specific thickness in microns. I guess I will try to speak to a jeweler but the problem is where I live Gold filled has not quite caught on as yet and so it is a relatively little known craft. In fact, we do not even manufature GF jewellery over here. I think it is mainly used in the US and Europe so I thought someone would be able to help on here.

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