Pair Round Martini Cocktail Stud Threaded Studs Earring MountingThis round 3 prong cocktail style martini stud settings with a threaded post, the settings are precisely crafted with metal mold for a finer finish. These high quality semi polished settings are intended for faceted gemstones, require notches to be cut according to your gemstone with the proper tools and skills to set and finish. One pair of semi polished settings only, Earring backs and stone sold separately. 0. 032"x 0. 0375" Threaded Earring Post,