Guillaume Voiriot ( 1713 - 1799 ) was a French painter. Guillaume Voiriot s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 2200 USD for Portrait d`une dame de qualité in 2005 to 50000 USD for Portrait of a gentleman, half-length, seated in a red velvet jacket with a violin in 2014 , based on the size and medium of the artwork.