CUBIC ZIRCONIA : We selected bright and superior cubic zirconia for these ear studs, and set them in four-prong settings. You'll fall in love with their scintillating sparkle! The timeless design of these elegantly understated earrings is perfect for day-into-evening wear. The threaded posts and screw-on backings keep these earrings safe and secure on your pierced ears for comfortable, worry-free wear all day long. SECURE SCREW BACKS : Our stud earrings have the security of a screw-on back for the reassurance that your precious jewels will not get lost. Screw the back to the post with a turning motion, much more secure than a push-on back! To put on, hold the ear stud front of the earlobe, then turn the threaded back from behind. QUALITY CONTROL: We have our own quality control team who will examine the ear studs before shipping which ensures us the finest products to our customers. If the ear studs fades inevitably, were devoted ourselves to guarantee a new replacement for free. : We always try to get your satisfaction, but there may be some force majeure inevitably which will let you have a bad shopping experience. Note: Data are all measured manually, please allow for an error of 1-3cm. Due to differences in light and display, there may be a certain color difference, which is subject to the actual object received.