18th century AD. A red jasper disc cloison with calligraphic text within concentric border rings, owner's name within a cartouche and verse from the Qur'an; set in a silver finger ring with keeled hoop and hatching to the rim of the bezel; accompanied by a museum-quality impression. 16 grams, 32mm overall, 19.82mm internal diameter (approximate size British T 1/2, USA 9 3/4, Europe 22.0, Japan 21) (1 1/4"). From the family collection of a Hampstead gentleman; formerly acquired in the 1980s.