Focus on this artwork and discuss the Pontifical approbation.
Pope Urban VIII granted the venerated Marian image a Pontifical decree of canonical coronation via his Papal bull "Domina Coronatum Est" signed and notarized on 14 August 1637 and granted to its patronal donor, Lord Ascanio Sforza y Pallavicini and Canon priest of the Vatican Chapter, Monsignor Ugo Ubaldini. 
The levitating diadem was manufactured by the Italian artisan, Fantino Taglietti, who charged 564 Italian scudo coins at the time. The official rite of coronation was executed on 31 August 1637.  The cherubic angels were added in 1713 by his descendant, later relocated to the "Chapel of the Holy Choir" within the basilica in 1749.
Italian scudo Pope Urban VIII signed Pope Chapel Papal bull canonical coronation