Magnificent 14K White Gold Blue Topaz Peridot Ring. This color-stone ring features a huge blue topaz in the center measuring about 9mm by 12mm with a weight of 3.68 carats, surrounded by smaller peridots. The top of the ring measures 11/16 of an inch across. The ring weighs 5.3 grams. It is a size 7. Sizing is available for an additional fee.