Material: .925 Sterling Silver or Real 18K Gold Plated over .925 Sterling Silver Stone: Emerald Cubic Zirconia Dimension : Trio Charm :5mm . Post Length: 6mm .Post Thickness 18g Dainty and beautiful, these tiny push pin studs are adorned with three prong-set Emerald Green Cubic Zirconia. The push pin earring post is easy to insert and remove from your ear, and the flat back makes it super comfortable to wear (no poking). Our push pin flat back earring studs are made of solid implant grade titanium and are hypoallergenic and always nickel free.