This Moissanite Pendant Platinum-Plated Necklace includes a certificate of the stone properties and a limited warranty card from the original overseas manufacturer for all pieces over 0.3 carats. Repairs are covered, but the purchaser will be responsible for return shipping costs. It also comes with a matching box for storage. Made with zircon accent stones, 925 sterling silver, moissanite, and platinum-plated material, this necklace features a minimalist design and measures 18 inches in chain length. The main stone is 0.5 carats and the overall weight is 0.08 ounces (2.15 grams). To ensure the longevity of this necklace, avoid wearing it during exercise as sweat can cause deterioration and corrosion over time.