DLRP Married Princesses Question

A while back I bought these pins from the DLRP married princess set:

I don't have pictures at the moment, but all of their dresses are tinged a light yellow, kinda like some of the older pins after being exposed to light for a long time. Does anyone else have the same problem? For the record, I purchased them like this - still sealed in their packs at a pin trading event. Just wondering if anyone else has seen this on these particular pins before...And then my next question would be, how do you value them if they are discolored? Belle and Jasmine are in my own collection so I'm not too bothered by it, but Snow White and Cinderella are in my traders so I'm unsure how one would go about pricing them/trading them.

Thanks in advance

This is happening with the Tinker Birthstone Cameo pins. I picked up two complete sets and Tinker is almost did colored on all of them. It's really weird. Theyre really nice pins though.

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