It was listed by Corvidae Antique. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Corvidae Antique has dated this Antique Ruby Diamond Ring to the 1910s.

Size: N (UK), approximately 6.75 (US).
Stamped with a European hallmark inside the shank, believed to be Austro-Hungarian.
The ring is in excellent antique condition, with normal wear commensurate with age.
Weight: 3.0g.
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Corvidae Antique has dated this Antique Ruby Diamond Ring to the 1910s.
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You can view the stock and full dealer information on the Corvidae Antique Profile Page