1/4 Ctw Semi-Mount Diamond Engagement Ring in 14K White Gold Want to adjust the diamond weight in an engagement ring to your taste and pocket limit, then a semi mount ring is what you need. If you are keen on an oval cut center stone, then this diamond ring might just be the ideal choice. You can have ranging from 0.35 carat to 0.45 carat diamond installed in the oval shape center mount. The attractive ring comes preset with 34 prong set round cut diamonds that line the shank. It is crafted in 14 karat white gold and is a ring that offers instant appeal. Total diamond weight is 1/4 ctw.