?DESIGN:Our molecule necklace promotes happiness and well-being- We turned serotonin’s chemical structure into a modern and intriguing piece of fine jewelry.Feel great when you wear or gift this happiness necklace,This piece offers a subtle way to remind yourself to be happy.Best gift choice for friends, sisters, mother, girlfriend, wife, daughter, teachers, science lovers or yourself as Christmas gifts. ?MATERIAL:Hypoallergenic 925 sterling silver,white gold plated,tarnish resistant, nickel-free,lead-free,cadmium-free and does not contain any allergic element,it won’t change color and get dark for lifetime wearing. ?SIZE:sterling silver molecule necklace size:30*15 mm,rolo chain length:18 ?BEST GIFT CHOICE:comes with LUHE jewelry gift box and a polishing cloth inside,this molecule serotonin necklace is a perfect gift for birthday,graduation,anniversary thanksgiving christmas mother’s day and valentines day,beautiful gift for mother,grandmother,daughter,wife,girlfriend,sister,aunt,mom,mum,mother-in-law,grandma,nana,granny,friends and yourself. ?LUHE jewelry provides 30 days replacement or refund for any reason.if you??re not completely satisfied, please feel free to contact us.