After a few days of the gold necklace purchased in the mall, white rust spots appeared on the top for a few days. Now they are suspected to have been deceived. If there is any insiders' help analysis, thanks!
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First of all, the white ones are not rust, gold should be yellow. There are two possibilities of white if there are white. Things, if these things are damaged, the mercury inside can easily adsorb on gold jewelry. I have encountered a lot of this situation. If this is the case, individuals cannot solve it. Treat it and then wear it, mercury is toxic.