M myrongaines Rough_Rock Joined Apr 14, 2021 Messages 5 May 3, 2021 #1 I was sold these post backs as solid 18K yellow gold. The hallmarks on the back are ones I haven't seen before. It's stamped CU 8K. Is it safe to assume it's really just 8K yellow gold instead? .
I was sold these post backs as solid 18K yellow gold. The hallmarks on the back are ones I haven't seen before. It's stamped CU 8K. Is it safe to assume it's really just 8K yellow gold instead? .
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pearlsngems Ideal_Rock Premium Joined Jan 4, 2010 Messages 3,160 May 3, 2021 #2 I have not see that specific mark but I'd assume they are indeed 8 karat gold.
kenny Super_Ideal_Rock Premium Joined Apr 30, 2005 Messages 34,659 May 3, 2021 #3 On the Periodic Table of Elements Cu is the symbol for copper. Maybe it just indicates there is copper in the alloy. So, maybe it's not a mark indicating the percentage of gold content after all. Last edited: May 3, 2021
On the Periodic Table of Elements Cu is the symbol for copper. Maybe it just indicates there is copper in the alloy. So, maybe it's not a mark indicating the percentage of gold content after all.