A Medieval gold stirrup ring

A Medieval gold stirrup ring, probably 13th century, the collet mount missing a stone, Size Q. 1.8g. The missing stone was probably a polished sapphire cabochon, a popular choice in the early Medieval period. See, Oman, C.C., Victorian & Albert Museum, Catalogue of Rings, London 1930. Plate 10, item 251, and Scarisbrick, Diana, Rings, Jewelry of Power,Love and Loyalty, Thames & Hudson, London 2007. P237, pl 322, also for a similar example.