Last Updated: Nov 22, 2016     Views: 21

From Kelley Elliott (curatorial assistant):

At this time we do not know any more details about the enamel solution or how these pieces were made.  From what I have read, each piece was heated at different temperatures and for different lengths of time.  The process is still a bit of a mystery.  Eventually our conservators will take a look at the chemical composition of the clear overcoat of the gemmaux as well as the adhesive used to hold the glass pieces together.