This is a gorgeous 18k yellow and white gold ring. The ring is centered with lovely emerald cut tanzanite that weighs approximately 12.00ct. The tanzanite is accentuated by lovely green tourmaline accents. The top of the ring measures 12mm by 15mm. The ring is stamped 18K and weighs 17.6 grams. The ring is size 8 but it can be resized.