This platinum ring mounting features a 4-prong center mounting that holds one 1-ct. (6.5mm, approx.) round faceted stone. The intertwined split-shank design is semi-mounted with graduated round accent diamonds in shared 4-prong mountings: 32 .4-pt., 20 .5-pt, and two 2-pt. (SI1 clarity/G, H color; 26.8 pts. TW). Pre-notched prongs provide a professional start to stone-setting with perfectly level stone seats already cut into each prong. Set your stone into the prongs to check the fit. If necessary, adjust the seat to best accommodate your stone. To secure the stone in place, burnish the prongs over the stone.