Minimalist Stud Earring Set by Solasta difference between A1 gold and A2 gold: check 2nd stud from the bottom :) Material: S925, gold-plated Sold by: Number of studs per set: 5pcs ✧ Tarnish - Resistant ✧ Shower - Proof ✧ Hypoallergenic Jewelry Care: ALL jewelries that are not made from SOLID GOLD will eventually fade over time. To make your jewelry last: ✧ Avoid contact with chemicals like perfume and lotion ✧ Store them properly to avoid getting them scratched from your other jewelries