#521 3rd Degree Masonic Blue Lodge Ring 10KT or 14KT Yellow or White Gold, Open or Solid Back #521. Plumb and trowel enameled into the sides of the shank. This is a relatively small ring. It makes a great man's pinky ring or ladies ring. Because of its size, I do not recommend going over a size 9.5. The approximate dimensions of the top of the ring are 9mm by 11mm.