An unusual 18th Century agate and carnelian set ring.
Set with an octagonal cut chalcedony to the centre with a carnelian engraved Persian intaglio seal at the centre. The engraving a prayer towards the first imam of the Shiaa Religion, Ali.
Probably French, circa 1790
US size 4 1/2
Material: Chalcedony, Carnelian, 18 carat rose gold
