Custom Listing for MC. 14k white gold 1/2cttw round diamond stud earrings. These diamond studs offer an exceptional value for money. These studs average a J/K color and I1 clarity and are held in sturdy 4-prong back settings, with friction back posts. Screwback posts are available for an extra charge. Our 1/2cttw studs average one half carat total weight and may vary slightly from .50cttw.