Amazing Mother of Pearl on Brass Choker Necklace Vintage Costume Jewelry

Brass with Mother-of-Pearl shell hard metal choker necklace, unmarked Approx. measurements: hard inner circle is 10 inches long by 6/8 wide front, back opening is 3 inches (straight open line "connecting" metal ends). Metal has some give but not very much. It can fit an adult neck (not all sizes) Made in India Circa 1970s-80s Vintage, pre-loved, sustainable, circular fashion accessory