Vintage ring 1930 (from a Holocost survivor)

Description

This ring was my Great-Grandmother who survived the holocost.
She received this ring from her mother who didn't survived and it's been in my family for 5 generations!!!
It has a great value for my family, but due to the world pandemic we have no choise but to sell this ring to save my family because nor me or my wife worked in the past year that much, and I rather sell this ring and not taking charity.
I'm sorry but I have no idea what kind of metal it is.
thank you so much for the person who will buy this, and BLESS YOU!!