Jewelry Closure: Spring Ring Clasp Link Construction: Solid Setting: Prong Shape: Heart Stone Cut: Heart Stone Millimeter Measurement: 9 Mm Length, 9 Mm Width Metal Color: White Chain Length: 18 Inch Pendant Length: 19.2mm Pendant Width: 12.8mm Chain Construction: Rope Care: Hand Wash Stone Type: 1 Lab Created Opal, 24 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.