Jewelry Closure: Spring Ring Clasp Link Construction: Solid Setting: Prong Stone Cut: Marquise Stone Millimeter Measurement: 12 Mm Length, 6 Mm Width Metal Color: White Chain Length: 18 Inch Pendant Length: 20.9mm Pendant Width: 7.5mm Chain Construction: Rope Care: Hand Wash Stone Type: 54 Lab Created Sapphire, 1 Genuine Topaz Authenticity: Genuine Stone Birthstone: December 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.