Gatsby Jewellery Ltd has dated this piece to the 1940s.
The stone is secured by four platinum claws with three diamonds set in each platinum shoulder. Pretty hand-engraving in the sides of each shoulder leads to a slender 18k white gold shank.

Cut:? The diamonds are eight-cuts.
Colour:? The diamonds are I to J.
Clarity:? The diamonds are SI2.
Carat:? Approximately 0.06 carat of diamonds.
Circa:? 1940.
Size:? K (UK) or 5 1/8 (US). Free sizing available.
Measurements:? The moonstone is 15.4 x 15mm. Sits 8.1mm from the finger.
Weight:? 4.43 grams.
Metal:? 18k white gold and platinum. Tested with a Niton DXL Precious Metal Analyzer.
Gatsby Jewellery Ltd has dated this piece to the 1940s.
Gatsby jewellery are a husband and wife team who have years of knowledge and experience in dealing in fine antique jewellery.
You can view the stock and full dealer information on the Gatsby Jewellery Ltd Profile Page