This statement ring does not have a metal mark but was tested with nitric acid and a AuRACLE tester to be 14k solid yellow gold. It weighs 13.8 grams. Set in the center is a large oval colorful natural opal with an approx weight of 13.6 cts. The opal has no chips or cracks. The opal is surrounded by 40 round brilliant cut natural diamonds with an approx total weight of .30 cts. The top of the ring measures 1 1/4" from North to South. It wears to a size 7 1/2 and can be resized.