Recent tests on the Isleworth Mona Lisa support the theory that the painting pre-dates the Louvre’s world-famous portrait by Leonardo da Vinci (1452-1519). Hidden in a Swiss bank vault for 40 years, the Isleworth Mona Lisa was unveiled to the public on September 27, 2012, inciting rampant speculation about the work’s history. The Louvre’s Mona Lisa, which is believed to have been painted between 1503 and 1506, has been considered the only one of its kind for centuries.

The Swiss Federal Institute of Technology and Alfonso Rubino, a specialist in “sacred geometry,” carried out tests on the 15th century Isleworth portrait after its unveiling. Carbon dating determined that the canvas was manufactured between 1410 and 1455, shooting down claims that the Isleworth Mona Lisa was a late 16^th century copy. Rubino’s geometric analysis also supported the da Vinci attribution, explaining that the geometry of the Isleworth portrait matched the geometry used by da Vinci in his other works including the Vitruvian Man (circa 1490).  

The new findings combined with the existing scientific and physical research build a strong case for the Isleworth Mona Lisa. The Zurich-based Mona Lisa Foundation is even on board with the claim, vowing to pursue efforts to prove the portrait’s authenticity.