Early Navajo Raindrop Ring with Petrified Wood Stone Size 7

Vintage 1930 Navajo raindrop ring that is set with a red & black petrified wood stone. It is a size 7 and the face measures 5/8" wide. All hand wrought with a clod chisel split. Needs to be cleaned as I see old crusty silver polish in the splits. Weight: 5 grams. Very tarnished. No hallmarks. Acid tested.