Vintage 7 1/2 amethyst & silver ring David Anderson Norway sterling 925 S

Vintage 7 1/2 amethyst & silver ring. Markings say David Anderson Norway 925 S is 92.5% Sterling which is very good sterling. . David Anderson came from Norway in 1922 and open shop in Boston. Has wear. Check photos as this is the exact ring. I bought this in an antique store about 30 or more years ago. I used a sizer and seems to be a size 7 1/2. David Anderson jewelry is highly collectible.