This Classic Stone works well with casual or evening wear. Blue Sapphire is known to be a calming and soothing gem. It is also a good stone for career change. These Sparkly Sapphire studs are Made From Solid Sterling Silver, and feature butterfly backings!Metal - Solid Sterling SilverPlating - 14K Yellow GoldStamp - 925Posts - Butterfly BackingsStone Treatment - CreatedCut - RoundSize - 6X6MMLead And Nickel Free , Safe For All Ears