This hardstone bust is stylistically reminiscent of northern Italian gem carving in the early 17th century; compare a larger cameo with a bust of Cleopatra attributed to Ottavio Miseroni (1568-1624), illustrated in Scarisbrick, op. cit., and another similar bust of a woman in the Royal Collection.
RELATED LITERATURE
D. Scarisbrick, The Art of Gem Engraving from Alexander the Great to Napoleon III, Fukuoka, 2008, p. 205, no. 242; K. Aschengreen-Piacenti and J. Boardman, Ancient and Modern Gems and Jewels in the Collection of Her Majesty the Queen, London, 2008, p. 109, no. 161