Dissolve My Nobel Prize, Fast! (npr.org)

    Back in Denmark, de Hevesy did a remarkable thing.
    He reversed the chemistry, precipitated out the gold
    and then, around January, 1950, sent the raw metal 
    back to the Swedish Academy in Stockholm.

Edit: Further research shows that the first reaction is a simple redox[1], which can (probably) be inverted using a galvanic cell[2].

[1] http://en.wikipedia.org/wiki/Aqua_regia#Dissolving_gold [2] http://en.wikipedia.org/wiki/Galvanic_cell