Jewelry Closure: Spring Ring Clasp Setting: Prong Stone Cut: Cushion Stone Millimeter Measurement: 9 Mm Length, 7 Mm Width Metal Color: White Chain Length: 18 Inch Chain Construction: Box Care: Wipe Clean Stone Type: 49 Lab Created Opal, 49 Lab Created Sapphire Authenticity: Lab Created Stone Birthstone: October Birthstone Metal: Sterling Silver Necklace Type: Halo Necklaces, Pendant Necklaces Pendant & Charms Type: Pendants Country of Origin: Imported Gemstones may be treated and may require special care. Metal may be rhodium plated to enhance appearance and reduce tarnishing. Photos are enlarged to show detail.