Gatsby Jewellery Ltd has dated this piece to the 1920s.
The stone is secured in a four claw yellow gold collet and is flanked by step-down shoulders set with six (three each side) eight cut diamonds. Crafted in 18k yellow gold. Currently UK size N, US size 6.5 (complimentary sizing available).

Accompanied by a sapphire report from The Gem & Pearl Laboratory stating the sapphire shows no evidence of heating, and is Sri Lankan (Ceylon) in origin.
Cut – Oval cut sapphire and eight-cut diamonds.

Colour – The diamond are F to G.
Clarity – The sapphire is loupe clean. The diamonds are VS1 to VS2.
Carat – The sapphire is 1.11 carat. The total approximate diamond weight is 0.12 carat.
Circa – 1920.
Size – N (UK) or 6.5 (US). Complimentary sizing is available, can go up or down.
Measurements – The sapphire is 7.4 x 6.0mm. Sits 4.9mm from the finger.
Weight – 2.69 grams.
Metal – 18k gold. Tested.
Gatsby Jewellery Ltd has dated this piece to the 1920s.
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