1/10 Ctw Emerald Mount Round Cut Diamond Semi-Mount Engagement Ring in 14K White Gold As a semi-mount ring this lets you choose a center stone for it. This is so you can buy a ring that suits your budget and your taste. The center stone for the semi-mount ring must however be an Emerald cut diamond. An emerald shape mount makes up the centerpiece, with raised prongs in the middle to hold the Emerald cut center stone that you choose ranging from 0.40 carat to 0.60 carat. The ring comes pre-installed with 20 prong set round cut diamonds that border the center stone from the main mount. A plain gold shank completes the look. The semi-mount ring is styled in 14 karat white gold. Total diamond weight is 1/10 ctw.