How much are my chanel earrings worth?

by melissa
(texas)

I have an old pair of Chanel earrings, iam sure they are authentic but iam curious how much they are worth. The plate in the back is oval and says chanel with copywrite and registed marks a 2 and a 9 with the cc in the middle of the two numbers and made on France. Under that oval plate it says 2907. I can't find a picture of them any place online. Thank you!