Cambridge Emeralds

I have found out that Nellie was bequeathed The Teck Emeralds; now know as the Cambridge Emeralds worn by Queen Mary, Queen Elizabeth II and Princess Diana.  She had an affair with German Prince Francis of Teck, Queen Mary's Brother, and was left the Teck Emeralds amongst others.  Queen Mary had his Will sealed in order to avoid a scandal and bought the Teck Emeralds back from Nellie for £10,000.  The sealing of Royal Will's then became common practice up until Princess Diana's time.