Corvidae Antique has dated this piece to the 1920s.
The amethyst (9 x 8mm) is a very unusual cut - it is faceted on the back and the front is a flat smooth curve (not a cabochon) giving the illusion of a briolette cut with a fabulous reflective depth and lots of colour.

In very good vintage condition.
Marked 14K inside the shank.
Size: M (UK), 6 (US). The oval face of the ring is 1.4 x 1.1mm, and it sits around 6mm above the finger. The shank is a knife-edge style, approx 1mm in profile.
Weight: 2.8g.
Corvidae Antique has dated this piece to the 1920s.
Hand picked jewellery from a friendly family business
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