Recognize vintage ring please!

[chawarma]

Hi,
I am trying to recognize this vintage ring.
I have to know year or symbol or something that will help me to value the price of it.
Thank you very much for helpers!

 

[Harpertoo]

Looks like a Freemason/Masonic symbol. I have no idea of the era. They were pretty common in the 50s.
Some others may have more insight.

 

[chawarma]

the diamond is real. how much it should be worth?