Miracle Sol D'or Celtic Brooch

This is my Sol D'or Miracle Brooch. I must admit looking at the signature I thought it said Soldor Miracle, and most brooches on ebay call it that too, but Sol D'or makes much more sense! Like my Mizpah brooch, this has been made by Birmingham maker A Hill & Company. Its a good solid brooch with what I assume is stone like glass in a gold tone metal.