Emerald 4-Prong Wire Basket Necklace Center MountingEmerald 4 prong east west wire basket necklace center blanks in different shapes, these 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. Sold individually. Semi Polished setting only, stone sold separately. Approx. O ring inside diameter: 1. 2mm to 1.