Vintage Mexico/925 Taxco Heavy Collar Onyx Necklace 100 gms

Modernist style heavy statement necklace on sterling silver. Had a huge black pendant. Excellent condition: only flaw I see was one side where the onyx was glued or something has some minor flaw that isn’t visible at all unless you pick it up and look closely. It could be scratch on the side base. The silver surface is excellent. I don’t know what it is. Sold as is! Please take a look at all pictures and enlarge.