Child Baby 10k Gold Signet Ring Vintage Art Deco c1920.
The gold mark can be found to the inside of the band, this simply reads '10k'.
Size UK D+, US 2.25 or internal diameter 1.35 cm or 0.5 inches.
Max with 0.6 cm or 0.2 inches.
Weight 1.0 grams or 0.625 penny weight.