Item type:925 Silver opal stud earringThe opal stone is lab created,they're not fragile as natural opal,you don't need to worry they'll break easily.925 Silver without allergic reaction, keeps shining & never lose color, they'll last for a long period.Tight butterfly post won't make your earring lost easily,the post in the stone center of back.Come with free gift box, suit for any occasion? ap899