Gatsby Jewellery Ltd has dated this piece to the 1940s.
Above the pendant is a high white, bright and internally clean old European cut diamond rubover set in platinum which connects to a 16 inch 18k yellow gold trace chain (this is a replacement chain i.e. not the original).

Cut – Emerald cut emerald and old European cut diamond.
Colour – The diamond is G.
Clarity – The diamond is VS2.
Carat – The emerald is approximately 0.35 carat and the diamond is approximately 0.20 carat.
Circa – 1925.
Measurements – From the top of the diamond to the bottom of the pendant is 12.7mm.
Metal – 18k yellow gold. The diamond is in platinum.
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