Yellow Gold Diamond and Opal Halo Engagement Ring Promise Ring. This ring is set with one genuine Oval Opal in the center and twenty-four genuine round diamonds. This Opal measures 10 X 8 mm and weighs 1 1/2 carats. The diamonds in this ring are H color, SI in clarity and weigh a total of .20 carat. This ring is 10KT Yellow Gold, weighs 2.5 grams and is a finger size 7 1/4, which can be resized (please inquire about sizing with the finger size you need). This ring will be accompanied by an appraisal written by a GIA Certified Diamond Grader with the retail replacement value of $1,645.00. I will ship this ring promptly in a beautiful gift box.