Jewelry Closure: Lobster Clasp Link Construction: Solid Setting: Prong Stone Cut: Cushion Stone Millimeter Measurement: 4 Mm Length, 4 Mm Width Metal Color: Yellow Chain Length: 18 Inch Chain Width: 1.15 Millimeters Pendant Length: 20mm Pendant Width: 7.3mm Chain Construction: Cable Care: Wipe Clean Stone Type: 1 Lab Created Sapphire Authenticity: Lab Created Stone Birthstone: September 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.