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 : Sapphire / Emerald / Champagne Casting size : Size S (5.0 x 4 mm) / Size M (6.5 x 5.0 mm) Gauge : 16g Post Length :6mm as listing OR If prefer 8mm please leave MESSAGE when check out an order