These older rings often have excellent diamonds. The remaining twelve diamonds have a total weight of approximately 0.37 ct. Yes the center stone can be purchased separately and re-set in a modern solitaire or other mounting. Vintage fine estate jewelry, excellent condition. Vintage or antique estate jewelry, probably circa 1910-20.
Pictures are enlarged for examination, the one with a dime is actual size.
The yellow gold RING mounting is a step corrugation with piercing on the sides. The tourmaline is estimated to be about 1.10 - 1.20 carat and it is flanked by three 0.02 ct. Please note the ring is shown actual size and then enlarged for closer examination. Contemporary fine estate jewelry. Synthetic spinel, made in the laboratory to duplicate the natural gemstone spinel, was very popular because it can be grown in almost any color.