Ring, size 4

Gold tone, deep purple stone solitaire ring. Depending on the lighting, it looks black or purple. See different pictures. Not sure of size. Looks like a pinky ring. Can find out size if interested. Diameter measures between 1/2 and 5/8 inch or 12.7 and 15.88 mm, which would be closest to a size 4 (14.9 mm)