Prendeville, J.: Explanatory catalogue of the proof-impressions of the antique gems possessed by the late Prince Poniatowski and now in the possession of John Tyrrell, Esq. (1841): 55
Comments: Brooch description in the NY sale (Doyle , NY: Thursday, June 20, 2013, lot 25): Gold, Orange Glass Intaglio and Cabochon Citrine Clip-Brooch, Elizabeth Locke 18 kt., mother-of-pearl backed, with maker's mark, ap. 31.3 dwts.