(Goldschmidt, New York); purchased 31 December 1911 by Peter A. B. Widener, Elkins Park, Pennsylvania, probably as Italian sixteenth century; inheritance from the Estate of Peter A. B. Widener by gift through power of appointment of Joseph E. Widener, Elkins Park, 1942.
- Inventory of the Objects d'Art at Lynnewood Hall, Elkins Park, Pennsylvania, The Estate of the Late P.A.B. Widener. Philadelphia, 1935: 47-48.
- Works of Art from the Widener Collection. Foreword by David Finley and John Walker. National Gallery of Art, Washington, 1942: 11, as Italian 16th Century.
- Steingräber, Erich. Alter Schmuck. Munich, 1956: 114, fig. 191. English ed. 1957: 113, fig. 191.
- Stone, Peter. "Baroque Pearls -II." Apollo (February 1959): 33, fig. 4.
- Newman, Harold. An Illustrated Dictionary of Jewellery. London, 1979: 313.
- Distelberger, Rudolf, Alison Luchs, Philippe Verdier, and Timonthy H. Wilson. Western Decorative Arts, Part I: Medieval, Renaissance, and Historicizing Styles including Metalwork, Enamels, and Ceramics. The Collections of the National Gallery of Art Systematic Catalogue. Washington, D.C., 1993: 297-299, color repro. 298.
Table-cut stones are in rectangular box settings with flat shields. There has been slight enamel loss.