1920s SILVER Chinese Import Mens Adjustable Shank Ring with Amethyst Cabochon 18x13x7mm Over 11 Carats

This is a stunning example of the Chinese import SILVER rings. I believe it is from the 20s but could be as early as the turn of the century. It has an 18x13x7mm amethyt cabocho that has some damage to the top That coul be natural inclusions but it is still a beautiful stone. It has an adjustable shank and it can go to a size 13 and is set at a size 11 now. It can also be squeezed togther for a smaller size. The shield shape on either side is a motif i have seen on other pieces from this era and it is marked SILVER on the inside.