YELLOW TOPAZ OVAL CUT RING SIZE 5.25 TO 5.50. 18KT GOLD HALLMARKED AND TESTED. Blue Zircon. 40. 75 1.45 2.00 2.85 4.00 5.60 7.50 8.20 13.50 17.50 23.00. Citrine. 23. 45. 85 1.25 1.75 2.40 3.20 4.50 6.50 11.00 14.00 16.00.