Freshwater pearl and Cz cocktail ring size 9

This ring is from an estate purchase showing little signs of use still in like new condition.  Genuine cultured white freshwater pearl surrounded by tiny white accent cubic zirconia gemstones prong set in metals that I’m not 100% certain on. Definitely not sterling silver , gold or platinum bases. The core base seems to be either copper, brass or bronze based with a plating of either white gold, rhodium, or platinum. I’ve done multiple acid tests as well as testing with a Kee gold tester. Measures a size 9. Markings on the inside of the band are CGT CN. I couldn’t find information on what CGT is for , but CN would mean made in China. Reasonable offers considered