Primary stone:synthetic Lab created white opal 6mm,Opal is October’s Birthstone Gemstone Metal: brass in great polish and plate with rose gold,all plating are nickel & tarnish free. ABOUT GEMSME: GEMSME is a professional compay to produce high quality jewelry. Each jewelry will be strictly checked before shipping.All products are nickel and tarnish free. SATISFACTION&GUARANTEED: Your satisfaction is our commision. if you are not satisfy with the purchase or jewelry, please just let us know. We offer 60 DAYS MONEY BACK GUARANTEE . Your satisfaction is important than anything.