Please send us the ring number after placing your order. Our products are 925 sterling silver. IT HAS ANTI-DARKEN FEATURE. If You Want a Different Color, You Can Specify It with Your Order Number. There is a price advantage compared to single purchase. The best way is to find out your finger measurements free of charge from the nearest jeweler and place an order. Width 4mm You can extend the life and shine of all silver jewelry products by keeping them away from substances such as perfume, deodorant, cologne, disinfectant and bleach. Our products are sent in wedding ring boxes. It will definitely NOT tarnish unless there is chemical contact (such as perfume and liquid soap).