Jewelry Closure: Spring Ring Clasp Link Construction: Solid Setting: Prong Shape: Cross Stone Cut: Heart Stone Millimeter Measurement: 5 Mm Width, 1 Mm Length Metal Color: Yellow Chain Length: 18 Inch Chain Width: .6 Millimeters Pendant Length: 22.9mm Pendant Width: 18.3mm Rounded Carat Weight: Less Than 1/10 Ct.t.w Chain Construction: Rope Care: Wipe Clean Stone Type: 1 Genuine Opal, 20 Natural Diamond Authenticity: Genuine Stone Birthstone: October Birthstone Metal: 10k Gold Necklace Type: Pendant Necklaces Country of Origin: Imported Gemstones may be treated and may require special care. Diamond total weights may vary between .01 and .08 carat. Metal may be rhodium plated to enhance appearance and reduce tarnishing. Photos are enlarged to show detail.