.54 Oval Cut Sapphire Diamond Stud Earrings in 18k White Gold.  These structured stud earrings feature .54 carats of blue sapphires and .19 carats of accent diamonds finished in 18 karat white gold. The two (2) .27 carat sapphires are oval cut and prong set. The sapphires have a highly saturated, royal blue hue and are accented by twenty-eight (28) .0068 carat diamonds. The near colorless diamonds have a lovely sparkle and are set on a milgrain 18k white gold backing.