Gerard Thomas ( 1663 - 1720 ) was a Flemish painter. Gerard Thomas s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 9737.89 USD for At a barber-surgeon´s in 2004 to 30791.6 USD for Le cabinet de l'alchimiste in 2009 , based on the size and medium of the artwork.