Back in 2009, Dick Johnson wrote:

Scott Miller writes:

Cameos were a favorite form of jewelry. This example features a cameo portrait of President Polk made by Salathiel Ellis in 1847. The gold chased mounting is by Alexander & Counts.

To read the complete article (scroll down to see the cameo), see:
Fashion and Frugalityfirst lady sarah polk(https://www.whitehousehistory.org/fashion-and-frugality)

To read the earlier E-Sylum article, see:
QUERY: SALATHIEL ELLIS PORTRAITS, CAMEOS SOUGHT(https://www.coinbooks.org/esylum_v12n19a13.html)