14k 14/20 Gold Filled ladies prong ring that features a stunning 10x8mm AA grade Swiss Blue Topaz gemstone. The prong setting and open back promotes light to pass through the stone to maximize brilliance. Size 7Â½ This beautiful handmade swiss blue topaz gemstone prong ring is inspired by Dale "Cougar" Armstrong's design. Handmade by DZI Designs. Not your size? No worries. You can special order one in your size. Contact us for more information.