PAVOI 14K Gold Plated Sterling Silver Post Stud Earrings for Women | Pave CZ Mini Disc | Gold Earrings for Women

What is the core metal, .925 sterling silver or bras? The ad states - 14K G over silver, but the product spec section states - yellow-gold-plated-bras

The center of 1 of the earrings is dark. It looks like a crystal is missing. Do we contact info@pivoi for a replacement?

Problem with earring

Are these able to be worn in the shower daily? Waterproof? Rustproof?