This is the sapphire brooch of Princess Mary, Countess of Harewood, whihch was sold at auction. Not a match for the Albert.
(Diana's was not a match either.)
The Prince Albert brooch
--Previous Message-- : There is a photo posted right now on the : British Royals MB showing Princess Mary in : the1920's wearing a similarly shaped brooch : on the front of a flapper dress. No idea : what it is, though. : : : : --Previous Message-- : I can't just locate it, but there was a : picture of the Princess Royal at a recent : evening function wearing a dark blue, high : necked gown with what appeared to be a : candidate for the brooch on the bodice. The : only other thing I could think would be a : candidate as the clasp to the pearl choker : from Empress Marie Feordorovna but I don't : recall that having a brooch clasp. : : --Previous Message-- : : it is Menkes who says - : : Prince Albert made copies of the brooch for : his own daughters, and the Queen has given : one of these to the Princess Royal. : : - but no reference source is supplied for : that assertion. : : : : : : :