Amethyst Necklace Sterling Silver Hallmark Help SHC Taxco Mexico

[Brash]

I have a necklace with 4 symbols (top) that I need help with. The 3 letters in the middle are SHC (Taxco, Mexico) and the last word says STERLING. What do the 4 symbols at the top mean? Not sure if my images went up okay, let me know if I need to fix it.

[Brash]

https://photos.app.goo.gl/CXxHBREy3z6nX7LS9

[dognose]

Hi,

Welcome to the Forum.

You need to embed your images.

Trev.