Au750 refers to jewelry containing 75% gold, and the remaining 25% is other precious metals. Platinum marked with Au750 or 18k is platinum, which is a silvery white precious metal element with stable chemical properties and is used for corrosion-resistant chemical instruments and jewelry. D0058ct is the weight of the main drill, 0.058ct, d020 1ct is the total weight of the matched drill, and the approximate value of 0.20 1ct is about 1500! /fan 00008888/blog/item/725 1f 6 177479382 EDC 540 17b . html & lt； /p & gt；