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sirmaladon wrote:I have been given some 9kt gold filled chains. each chain is 34 grams, I asked where they got them and i asked the manufacture what the gold filled ratio was, either 1/20 or 1/40. they came back and said the gold filled was 40um thick. each one has 5.5 square inches of surface area, its a rectangular chain. i have been trying to figure the amount of gold in each chain to see if they are worth refining. I tried using the Gold-N-Scrap calculators but i'm unsure if the ratio is 1/50 for gold filled as an option on the website or figure it using the gold plate calculator? Any help would be great, thanks for your time
Oz wrote:Gee GSP, all that math and not even a thank you.
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