3/4 Ctw Semi-Mount Round Cut Diamond Engagement Ring in 14K White Gold Decide on a semi mount ring if you want the centre stone to be in a diamond weight that you are comfortable paying for. This semi mount diamond ring allows you to select a round cut diamond ranging from 0.50 carat to 0.70 carat, for its centre mount. While you can choose your centre stone, the ring comes preset with round cut diamond embellishments. There are 12 split, prong set round cut diamonds decorating the shank, 6 on either side of the centre mount. The ring is styled in 14 karat white gold. Total diamond weight is 3/4 ctw.