Gemstone Jewelry - This is a 10K gold plumb ring with .25 ct purple garnet gem with 2 tiny diamonds.
It is a size 8, hallmarked 10KP, signed GRT, is slightly over .25" wide and weighs 1.6 grams.
Sweet vintage ring, has some light surface scratches.
10KP is for plumb gold, a karat marking followed by a "p" indicates the piece is plumb, meaning the purity is exact.