The pendant is marked 750 and is 18k white gold. It weighs 8.9 grams and is custom made. The piece measures 1 1/2" x 11/16". It can also be worn as a pearl enhancer. The top holds a 8.5 mm gray saltwater pearl. It is surrounded by 25 round brilliant cut natural diamonds with an approx total weight of .50 cts. They are SI1 TO SI2 and white. The bottom pearl is a 10.2 mm South Sea , which is top quality. It is surrounded by 70 + round black natural pearls with an approx total weight of 1.50 cts. The loop on the back can accommodate up to a 4.5 mm chain.