Gold Ring

I need help identifying the maker of this ring, the type of stone and in what Era it was made and roughly what it is worth. It turns red under a UV flashlight. I appreciate any help I can get.

 

The ring was probably made sometime in the last 50+ years,the maker's mark is too blurry to see.Too many stones turn red under a uv light ,see list...... https://www.realorrepro.com/article/Black-light-and-gemstones

 

I was thinking 1960s/70s from the design. The stone might be synthetic, an amethyst, or ....? Does it change color in natural light vs ultra-violet? It's the color of some synthetic color-change stones, at least the color they are in natural light. They go light blue under fluorescent bulbs. No clue about LEDs.

 

This is the full image size.....not enlarged.....just not a thumbnail......If it's backed off to about 50% you can see a Large "D" and an "8"......I believe......

 

Welcome to the forum, Pepper.
I agree, Brutalist style, 60s-early 70s.
Could you take another picture of the mark, please? And a closeup of the stone (without the 'hand')?