Chinese Export Turquoise Ring in Sterling Silver Filigree

Vintage Chinese export ring in sterling silver filigree. It has a gold wash on the silver. Set with clean turquoise, this stone looks blue in some light and more of a seafoam green in other lighting conditions. It has a split shank so it is adjustable in size. Right now it is a 7. Face measures 3/4" wide. Weight: 6 grams. Marked silver. Some tarnish. C. 1940.