Jewelry Closure: Spring Ring Clasp Link Construction: Solid Setting: Prong Stone Cut: Oval Stone Millimeter Measurement: 6 Mm Width Metal Color: Yellow Chain Length: 18 Inch Pendant Length: 21.6mm Pendant Width: 12.6mm Chain Construction: Rope Care: Hand Wash Stone Type: 1 Lab Created Opal, 16 Lab Created Sapphire Authenticity: Lab Created Stone Birthstone: October Birthstone Metal: 10k Gold Over 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.