Estate Three Stone Diamond Ring, Cushion cut 1.52ct:

Centering a Cushion cut diamond weighing approx. 1.52ct (G color, SI1 clarity), flanked by two Triangular cut diamonds weighing approx. 1.10ctw, fashioned in 18 white gold. GIA #1182439918. Last half of 20th century. Size 8 1/4.