Abalone vintage bangle

Vintage abalone bangle bracelet (a kind of mother-of-pearl from another mollusk) mounted on a base that looks like wood, probably polished ebony. 

Between the 70s and 80s. 

7 cm in diameter and 20 cm in internal contour In good condition. 

The metal is NOT gold or silver so it can cause allergies. 

The images are part of the description.