Gatsby Jewellery Ltd has dated this piece to the 1900s.
A smaller old mine cut diamond sits at the outer edge of the cluster. All seven of the gems are claw set in platinum and sit on a slender 18k yellow gold shank.

Size L (UK) or 5.5 (US). Free sizing available.
Accompanied by an independent jewellery report from IGR.
Cut – Old mine cut diamonds and round cut rubies.
Colour – The centre diamond is O/P, and the outer diamonds L to M.

Clarity – The centre diamond is SI2. The outer diamonds are SI2 to I1.
Carat – The centre diamond is approximately 1.25 carat, with a further approximate 0.08 carat of diamonds in the sides. The total approximate ruby weight is 1.20 carat.

Circa – 1905.
Measurements – From the edge of one outer diamond to the other is 18.3mm. The ring is 8.4mm at the widest point and sits 4.4mm from the finger.
Size – L (UK) or 5.5 (US). Free sizing available.
Weight – 3.94 grams.
Metal – 18k yellow gold. The head of the ring is platinum. Tested.
Gatsby Jewellery Ltd has dated this piece to the 1900s.
Gatsby jewellery are a husband and wife team who have years of knowledge and experience in dealing in fine antique jewellery.
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