Jewelry Closure: Spring Ring Clasp Link Construction: Solid Setting: Prong Stone Cut: Round Stone Millimeter Measurement: 8 Mm Length, 8 Mm Width Metal Color: White Chain Length: 18 Inch Chain Width: .6 Millimeters Pendant Length: 24.7mm Pendant Width: 18.6mm Chain Construction: Rope Care: Wipe Clean Stone Type: 1 Lab Created Opal, 39 Lab Created Sapphire Authenticity: Lab Created Stone Birthstone: October Birthstone Metal: Sterling Silver, 10k White Gold 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.