Gatsby Jewellery Ltd has dated this piece to the 1950s.

Accompanied by an independent jewellery report from IGR (#30309984).
Cut – Round brilliant cuts and baguette cuts.
Colour – The diamonds range from F to H.
Clarity – The diamonds range from VS1 to SI1. All are clean to the naked eye.
Carat – Approximately 1.00 carat of round brilliant diamonds and approximately 1.72 carat of baguette cut diamonds.
Circa – 1950.
Measurements – The brooch is 38 x 21.2mm.
Metal – Platinum. Tested.
Gatsby Jewellery Ltd has dated this piece to the 1950s.
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