Art Deco 925 sterling silver ring w green emerald color stones, size 5.75

Rare antique sterling silver Art Deco ring. Beautiful and unique. With lots of details, natural green emerald color stones (not sure what they are) and natural marcasite stones. Size 5.75. Few marcasite stones are missing, as shown in the closeup pictures. But this is not too noticeable because of the design. Other than that this ring is in very good condition.