Roman Silver Ring with Capricorn Gemstone

3rd century AD. A silver finger ring with sloping ribbed shoulders, inset jasper(?) gemstone with capricorn. Cf. Ruseva-Slokoska, L. Roman Jewellery, Sofia, 1991, item 183. 6.34 grams, 24.82mm overall, 19.19mm internal diameter (approximate size British R, USA 8 1/2, Europe 18 3/4, Japan 18) (1"). Property of a London gentleman; acquired on the UK art market since 2011; previously in English collections since before 2000.
Condition Report: Fine condition. A large wearable size.