Material : Sterling silver , Nickel Free Silver : Rhodium over sterling silver Gold : Yellow gold/rose gold over sterling silver Stone : Swiss star cut cubic zirconia Stone color : Garnet / Champagne / Sapphire / Amethyst Casting size : 9.8 x 6.9 mm Gauge : 16g Post Length :6mm as listing OR If prefer 8mm please leave MESSAGE when check out an order