Edwardian Niello Curb Link Chain signet rings The head is split into

The head is split into segments

Stone: Single cut diamond

I suspect that

The ring is fashioned in 18ct gold with a London hallmark inside the band

and confirm the gold is solid 22 carat

Edwardian Niello Curb Link Chain signet rings The head is split intoCool antique curb link chain in niello silver and rose gold vermeil. It features plain rose gold curb link sections between longer links of niello and rose gold. Likely French, it dates from the early 20th century circa 1910 with both bolt ring and dog tag clasps. Era: Edwardian circa 1910 Length: 15. 5 inches Width of links: 3. 4mm Weight: 9. 2g Marks: Stamped 800 (silver) with rose gold vermeil Condition: Good antique condition. Signs of wear