A few weeks ago, I read Ghosthunters: A Journey through Haunted France by Simon Marsden. In it, he briefly discusses the tape recording theory. The theory "proposes that certain inanimate objects, such as stone or wood, that are frequently found in ancient buildings, are capable, because of their chemical make-up, of storing extreme human actions and emotions such as violence, fear and suffering, similar to how modern recording techniques store images and sounds."
The notion of inanimate objects storing powerful or poignant memories must have been lingering in my subconscious, like a specter in an abandoned attic, because it was the first thing I thought of when I happened upon the Christie's website and saw gold alliance rings once owned by the Duc de Chartres and his unfortunate wife.
Allow me to tell you a little about the Duc de Chartres. Only then will you understand my leap in reasoning. Louis Philippe Joseph d'Orléans was a French nobleman. He was not just any old French nobleman, though. He was a member of the Bourbon family, a cousin by blood to Louis XVI.