Corvidae Antique has dated this piece to the 1940s.

SIZE: J and a half (UK), 5 (US). The fiery pastes are each around 7mm diameter (equivalent to around 2.5 carats if they were diamonds).
WEIGHT: 2.0g.
MATERIALS: Nine-carat (375) gold, silver, paste gemstones. The pastes are set into silver, as was traditional with antique diamond rings of this style.
HALLMARKS/STAMPS: Stamped 9CT CIRO.
CONDITION: The ring is in excellent antique condition.
ERA: Estimated c.1940s.
Corvidae Antique has dated this piece to the 1940s.
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