AGS Certified 5/8ct TW Round Diamond Stud Earrings in 14K White Gold with Screw Backs 5/8ct means .60ct minimum weight. 14K White Gold settings and Screw-Backs Velvet Earring Box Gift Ready All of our diamond suppliers and MLG state that to the best or their/our knowledge that all of our diamonds are conflict free. When shopping for a diamond, trust the AGS Laboratories. We protect consumers by providing expert, third-party evaluation of a diamonds quality characteristics. 5/8ct means .60ct minimum weight. 14K White Gold settings and Screw-Backs Come packaged in a beautiful box, ready to be gifted. AGS (American Gem Society Certificate Included). Each earring is numbered and tagged by AGS with a unique number corresponding to the number on the certificate, which can be searched on their website.