vintage (looks 50s, but is from the 80s) choker from Taxco.
made of sterling silver and brass, over a thick black leather cord.
has a natural black onyx stone pendant. 

weighs just under 50 grams, but probably only a quarter of that weight is silver. 

tarnished, and with some general wear. uncleaned. please look closely at pics. 

about 16" around the inside when closed. you'll want to have a neck under 14.5" so that it lays nicely when worn.

if you live in another country, please make sure you're allowed to import silver before purchasing.