Corvidae Antique has dated this piece to the 1930s.
1930s.

SIZE: P (UK), 7 and a half (US). The face of the ring is approximately 2.2 x 1.5cm and the amethyst is approx 8 x 11mm.
WEIGHT: 3.0g.
MATERIALS: 935 silver, amethyst.
HALLMARKS/STAMPS: Marked "935" - a silver fineness higher than sterling silver (925). We most often see 935 on pieces from Germany, Austria and Switzerland c.1920s-40s.

CONDITION: There is minor overall wear, as you would expect to see in a piece of this age, and the amethyst is lightly abraded on the top facets when seen under magnification, but the ring is in very good vintage condition.
ERA: c.1920s-30s.
Corvidae Antique has dated this piece to the 1930s.
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