Vintage amethyst sterling silver ring sz 6.75 marcasite art deco engagement ring

...cocktail ring, 925 silver statement ring size N An attractive sterling silver ring, set with marcasite around a smaller oval amethyst. In a beautiful art deco style, this would be a great cocktail or engagement ring. Exact date of make unknown. It has been hallmarked '925' for sterling silver and a capital F in a diamond or gem shaped field. The face measures 16mm x 22 mm. This ring is a UK size N or US size 6-3/4.