Generally, a ring will be marked with three indicators: trademark, commodity material and diamond size. ALY: merchant logo Pd950: The precious metal used in the ring is palladium. Pd comes from palladium, the abbreviation of Palladium in English, D 0.047 ct: D stands for diamond, which comes from the initials of diamond, 0.047 is the weight of diamond, and ct is the abbreviation of diamond weight-carat.