IGI-Certified 18k Gold Round-Cut Diamond Studs (1 cttw, H-I Color, SI1-SI2 Clarity) With their near-colorless appearance, these sophisticated diamond studs sparkle and reflect the light with every turn of the head. Screw-back closure All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. Domestic Carat weight listed is the total for both studs.