Gatsby Jewellery Ltd has dated this piece to the 1910s.
The stone is secured in a four claw collet with an open gallery, leading to slim shoulders set with six (three each side) eight-cut diamonds to a slender 18k yellow gold shank.

Accompanied by a report from Gemmoligical Certification Services (GCS) stating the sapphire shows no indication of heating, and is Burmese (Myanmar) in origin.
Cut – Cushion cut sapphire and eight-cut diamonds.

Clarity – The sapphire is eye clean, the diamonds are VS.
Carat – The sapphire is 0.50 carat, with approximately 0.05 carat of diamonds.
Circa – 1915.
Size – J 1/2 (UK) or 5 (US). Complimentary sizing is available, can go up or down.
Measurements – The sapphire is approximately 5.3 x 4.2mm. Sits 5.2mm from the finger.
Metal – 18k gold. Tested.
Gatsby Jewellery Ltd has dated this piece to the 1910s.
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