These earrings feature artificial diamonds and cubic zirconia. With a diameter of 7mm, they offer a luxurious feel. The base material is sterling silver (Ag925), which is gentle on those with metal allergies. (Manufacturer's description) To increase hardness, a silver alloy with 92.5% silver purity is used instead of pure silver. These are genuine precious metal products, not imitations like brass, stainless steel, or copper alloys, and they use metals that are less likely to cause allergic reactions. Both the catch and post are stamped with S925. While 925 silver is generally safe for everyone to use, it is not recommended for those with extremely sensitive metal allergies. Shipping is planned via standard mail, but if you prefer, you can change to Click Post for an additional 100 yen. Please let us know if you would like to do so. Earring Shape...Catch/Stud