Vintage Ring 18 kt Yellowgold great blue-green Turmalin with Hallmarks

The loveliest piece of jewelry from an inheritance, put together with a lot of love, a ring in 750 yellow      gold, with master's mark, simple setting, a great blue-green tourmaline of 1.50 ct and two old-cut 
diamonds total approx. 0.04 ct, W (white) / P1 (clear inclusions), can of course be polished on request, weight  approx. 2.80 grams, dimensions approx. 9 x 18 mm in, Rw 17.8 / 52 mm, few signs of wear