Vintage Sterling Silver Rhodonite Ring Size 8

Vintage Mid-Century ring is marked sterling C and features a large cabochon, 3/4 inch by 1/2 inch wide.  I believe this stone is Rhodonite but I am not 100% sure.  It has salmon, light pink and black coloring with Quartz.  It measures a ring size 8 and it weighs 4.7 grams.  It is in great condition.