There is not a way to get the color back in costume jewelry. The
jewelry on the costume is not real.
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Disney Fairies Hidden Treasures - 2013 VG was released on:
USA: 1 May 2013
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Hidden Treasures - EP - was created on 1995-07-18.
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RMN is the trademark of The Roman Company. You most likely have
costume jewelry or a replica of gold or silver jewelry. It isn't
real gold or silver but it is a good knock off.