This is a very cool bracelet! It features alternating bands with five prong set green rhinestones and bands with a geometric ribbed pattern.
This piece appears to be from the Art Deco/Machine Age Era, circa 1920-1935.
The bracelet measures approximately 1" wide, with each band measuring approximately 1" x 1/4", and approximately 6" around, without stretching to expand. It is unsigned, nicely constructed and in very good condition.