Two laboratory examinations revealed that the blue and red pigments are authentic medieval colours and are original to the sculpture, and that the limestone was quarried from sources in France. The pigment analysis revealed that the blue colour is azurite and the red is lead-oxide. Further investigation has also recently revealed the presence of a brown colour on the archangel's tunic, and a yellow/ochre colour over the robes. It remains for these colours to be analyzed, and at this time it is not known whether the yellow colour is the remains of a preparatory underlayer, or is an actual paint layer.

The analysis of the stone was conducted at two laboratories, one in the United States and one in France. Both concluded that the limestone was consistent with the material of other French medieval sculptures and may have derived from the same quarries that furnished the stone for the sculptures on Nôtre Dame Cathedral in Paris or Nôtre Dame Cathedral in Chartres.

Further examination of the sculpture using ultraviolet light also demonstrated that the upraised right arm had been broken off and reattached, and the head had been broken at the neck and reattached.