Jewelry Closure: Spring Ring Clasp Link Construction: Solid Setting: Prong Stone Cut: Cushion Stone Millimeter Measurement: 10 Mm Length, 8 Mm Width Metal Color: Yellow Chain Length: 18 Inch Chain Width: .6 Millimeters Pendant Length: 26.8mm Pendant Width: 18.3mm Chain Construction: Rope Care: Wipe Clean Stone Type: 16 Lab Created Sapphire, 1 Lab Created Opal Authenticity: Lab Created Stone Birthstone: October Birthstone Metal: 14k 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.