$72 Signed Native American Estate Ring Silver Size 8 Marked T W Sterling

I Tried To Find Out What Type Of Natural Stone Is Featured In This Ring, But I Could Not The Main Body Is A Dark Green And As You Can See In The Photos, There Are Some Raised Features Of Blue And Brown I Believe The Artisan Would Be Terry Williams, A Navajo Silversmith Crown Measures 1 Inch By 1 & 1/2 Inches Ring Is A Size 8 You Can Tell That This Is An Older Estate Piece And Is Not Without A Few Little Flaws I Personally Have Always Been Fond Of Not Only Genuine Stones, Polished And Beautiful, But Also Those In Their Natural State Priced To Sell For $72 From The Genuine Stoner Closet