.67 Emerald Cut Sapphire & Diamond Ring in 18k White Gold. 67 Emerald Cut Sapphire Diamond Ring in 18k White Gold. This antique inspired ring features a . 67 carat blue sapphire and . 14 carats of diamonds finished in shimmering 18 karat white gold. The center sapphire has a deep, royal blue hue and is set in four prongs. The sapphire is emerald cut, with distinctive step facets that provide for a gorgeous depth of color, accenting the rich natural color of the primary stone. The center sapphire is accented