Coach Earrrings??

Hi. I'm new to this forum and this is my 2nd post. I love reading all the post and seeing the new bags!! :tup: My question is how can you tell if a pair of earrings are real? I'm wanting these (in the link below) but in all gold/brass. Did they make them like that? I found a pair online but scared to give full price incase it's a knock off pair.
http://www.coach.com/content/Product.aspx?category_id=110&product_no=8783

Thanks,
Tara