Justus Sustermans ( 1597 - 1681 ) was a Belgian painter. Justus Sustermans s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 2951.79 USD for Portrait of an elegant lady with a golden necklace in 2004 to 35689.14 USD for Portrait présumé de Matthias de Médicis in 2011 , based on the size and medium of the artwork.