Originally $475.00. Vintage Mexican Necklace with Black Onyx inlayed in Sterling Silver. This necklace is a dream to wear and is of excellent craftsmanship: The hinged design allows this necklace to lay beautifully just like a collar that fits well around the neck. The inner circumference is 16 3/4 inches It is stamped "Mexico" and 925 The condition is excellent with minimal wear.