Opal & Cubic Zirconia Gold Ring- 559 $35 or $30 w/offer

This opal and cubic zirconia gold ring is stunning. The opal might be real or man made. I do not know for sure. However, the stone is surrounded with grayish cubic zirconia stones. The metal is gold over stainless steel. I got the ring back in the 1990s at either Macys or Mervyn’s. The metal is marked on the inside of the band. It is about a size 7.5. It is 18kt G.F., I think is what the engraving says. There is a small black spot in the band as seen in the last photo (about 1/4”).