This 14-karat white gold ring mounting features a square halo around the center mounting that is set with 16 .4-pt. diamonds (SI clarity/G,H color; 6.4 pts. TW) in shared 4-prong mountings. The center mounting accommodates one .20-ct. (3.7mm, approx.) round faceted stone. This ring has a split shank with a smooth, bright finish. Cut a seat in the mounting to accommodate your stone, then burnish the prongs over the stone to secure it in place.