Royal jewels: Princess Ingeborg's Fabergé brooch - sold during WWII?

A Fabergé brooch (external link) which was given by the King's maternal grandfather, Prince Carl of Sweden, to Princess Ingeborg on the occasion of their fifteenth wedding anniversary in 1912 was sold by the auction house Coutau-Bégarie in Paris this week.
Several people have asked me about this and the auctioneer's claim that the brooch was sold by Crown Princess Märtha out of necessity during the Second World War. I do not know what is the auction house's source, but to me this seems like a misunderstanding or a supposition.
As I was able to reveal in my 2007 biography of Princess Astrid, Kvinne blant konger, the emerald parure now worn by the Queen was given to Crown Princess Märtha by Princess Ingeborg at the Central Station in Stockholm when she departed for the USA in the summer of 1940. Princess Ingeborg's intention was that her daughter could sell the emeralds if she never returned to Norway (which must have seemed a likely outcome in 1940), but the daring rescue of that the Bank of Norway's gold reserve meant that the Norwegian government-in-exile (unlike others) was able to provide for itself throughout the war and that the royal family did not have to sell their possessions in order to survive.
It therefore seems highly unlikely that Crown Princess Märtha sold the Fabergé brooch out of necessity during WWII.