Feature--Butterfly Lock earring .Color: white and blue Primary Stone--6mm synthetic Lab created white opal 6mm,Opal is October's Birthstone Gemstone Solid 925 sterling silver--Hypoallergenic , tarnish free, nicklel free and they don’t rust. Perfect Gift---very easy to open & close for Men, Women & Children Satisfication--We offer a 100-day satisfaction money back guarantee. If you’re not satisfied for any reason, you will receive a full refund upon returning your purchase within 100 days.