Abstract: A gemstone assembly includes one or more gemstones and a setting having a base formed with a plurality of ribs defining one or more sockets of polygonal configuration for receiving the gemstones. Each gemstone is of a polygonal configuration corresponding to its socket, and is formed with an upper table, a lower pavilion, a girdle, and grooves extending through at least two opposed sides of the pavilion just below the girdle, the ribs of the setting being bent at their outer ends into the grooves to fix the gemstones in their sockets.