Vintage mother of pearl ring

beautiful vintage mother of pearl cocktail ring -Approx a size 7.5 -Features gunmetal rhinestones, 2 are missing (one at the very top, and one at the very bottom) not noticeable when wearing -Silver tone with marking “NF” and what looks like “THAI” -Fair vintage condition, signs of wear in the silver at the back of ring, 2 missing gems