All of our WINGROUPJEWELRY's products are used Premium and High Quality Materials that you just need to do some basic care. Although professional cleaning are recommended as after as once a year. We offer all of our customers free one year limited warranty to do professional cleaning such as cleaning gemstones, restraining and repairing clasps and earrings backs. As we always prioritize our brand, we only use real and authentic materials. Avoid exposing gold jewelry and silver jewelry to household bleach which will quickly cause gold to discolor and possibly disintegrate. Jewelry storage is important as well. At the time of purchase, all WINGROUPJEWELRY is wrapped in a protective box, case or tarnish-resistant pouch. Between wearing, we recommend that you place it back in its original case or another suitably lined box or pouch.