Please help with identifying makers mark on sterling silver

Simona your necklace is from Israel. I have quite a few pieces.

 

If this is more accurate for color, I'm leaning toward glass. I like it though; in my favorite family of colors.

I'm wondering whether what you are describing, that isn't showing up well in photos, is a druzy formation of quartz. You say it is like amethyst. Is it purple, not the brown it appears in pix?

 

Thank you so much, I think you’re spot on the druzy formation of quartz.
I mentioned amethyst, as I couldn’t describe the raw material, the structure, not the colour. I have not seen many stones in their natural form, except for an amethyst geode.
My ring stone colour is brown, and in the middle is not polished, it shows the raw stone.
My photos aren’t great to show it, the ring below taken from an website is close enough.

https://gem.app/search?terms=brown Druzy quartz ring solid