Ross-Simons - .30ct London Blue Topaz Ring, Diamond Accents in 14kt Yellow Gold. Size 9. RS Pure. Modern designs that complete your outfit and complement your personality. Perfect for gemstone lovers or blue-eyed beauties, this dainty ring features a .30 carat emerald-cut London blue topaz sparked at each side by icy diamond accents. Set in polished 14kt yellow gold, it's ideal for adding a bit of color to your favorite stack. 1/8" wide. London blue topaz ring. Blue Topaz birthstones are the perfect gift for December birthdays.