Great selection of economically priced sterling silver cubic zirconia birthstone stud earrings. 925 sterling silver studs with top quality AAA grade cubic zirconia stones. These birthstone studs are available in round and square stone shapes. The birthstone earrings are offered with either a prong setting or basket setting. The prong setting is a more petite setting, which the stone sits slightly closer to the ear. The prong setting utilizes 4 prongs (bars) to hold the stone in place. The basket setting, uses a "basket" to fully surround the cz stone, which is the most secure way to protect the stone.