Jewelry Closure: Spring Ring Clasp Link Construction: Solid Setting: Prong Stone Cut: Oval Stone Millimeter Measurement: 14 Mm Length, 8 Mm Width Metal Color: White Chain Length: 18 Inch Pendant Length: 21.4mm Pendant Width: 8.4mm Chain Construction: Rope Care: Hand Wash Stone Type: 1 Lab Created Opal, 62 Lab Created Sapphire Authenticity: Lab Created Stone Birthstone: October Birthstone Metal: Sterling Silver Necklace Type: Pendant Necklaces 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.