Keywords: Regulski Jewel with a portrait 03.jpg Artwork Creator Jan Regulski intaglio Creator Jean Martin setting 1786/1787 sapphire diamond gold Institution Warsaw Royal Castle accession number object history < 1787 commission Stanislaus Augustus Poniatowski Warsaw ProvenanceEvent 1787 gift Alexander Bezborodko Kaniów ProvenanceEvent deposit Royal Castle Warsaw Private collection credit line J R monogram Created in Warsaw the brooch with an intaglio engraved on a Ceylonese sapphire was part of largest collection of gems in the 18th-century Poland Presented to Alexander Bezborodko on the occasion of King's meeting with Catherine II of Russia in Kaniów in 1787 own See below PD-old-100 DEFAULTSORT 1786/1787; Jewel with a portrait Jewel with a portrait of King Stanislaus Augustus |