My gold rings turning into silver?

I have been married for 11 years and have worn my solid gold engagement and wedding ring continuously. I woke up one morning to find both of my rings had turned to silver. This is not a hoax, it is true. I have had no cemicals near them and I've always worn the same branded rubber gloves. The only thing that is different was that I started taking the Yasmin (birth control pill) a week ago. The color is a dull silver like they've come out of a christmas cracker. I've kept them off my finger for 2 days now and the colour is now a horrid copper. May be they'll turn back to gold I don't know but can anybody explain. And please no pathetic answers.