Gatsby Jewellery Ltd has dated this piece to the 1930s.
The sapphire is secured in a four-claw collet with buckle shaped, diamond set shoulders above cheniers, to D-shaped platinum shank.

Accompanied by a report from Gemmological Certification Services (GCS) stating the sapphire shows no indication of heating, and originates from Sri Lankan (Ceylon).
Cut – Cushion cut sapphire with eight-cut diamonds.

Colour – The diamonds are F to G.
Clarity – The sapphire is eye clean. The diamonds are VS1 to VS2.
Carat – The sapphire is 3.13 carat. The total approximate diamond weight is 0.12 carat.
Circa – 1930.
Size – K (UK) or 5 1/8 (US). Complimentary sizing is available, can go up or down.

Measurements – The sapphire is 8.7 x 7.1mm and sits 6.1mm from the finger.
Metal – Platinum. Tested.
Video – To view a video of this ring recorded in daylight, please copy / paste the following link into your browser: https://vimeo.com/834765955?share=copy
Gatsby Jewellery Ltd has dated this piece to the 1930s.
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