For your purchase of 3 Carat Sterling Silver Moissanite Ring, you will receive a certificate of stone properties for the main stone measuring over 0.3 carats. This limited warranty protects against any issues and defects - please reach out to us for assistance. The materials used are 925 sterling silver, Moissanite, and Zircon (accent stones), with a total carat weight of 3. Proper care for this piece includes avoiding wearing it during physical activities as sweat can cause silver chloride and copper sulfide to form, which can damage and corrode the jewelry over time. This product is imported.