The sapphire is not round, but square. I have never seen this brooch with a sapphire. I have found in old newspapers reports of Wilhelmina wearing different colours of stones in one outfit, so I think we shouldn't jump to conclusions too quickly on the brooch in the old picture being emerald because the other jewellery is emerald...
--Previous Message-- : First the brooch contained a square emerald : and pearl pendant: : : : : The central emerald and diamond cluster is : then replaced with this round sapphire set : in diamonds: : : : : And this is what we have today: : : : : --Previous Message-- : I believe it was a square(ish) emerald but : was : later replaced by the round sapphire and had : the pearl drop removed. : : --Previous Message-- : I've cracked my head on this one as well but : it is the emerald tiara. What interests me : is that the brooch with the pearl actually : is a sapphire and not an emerald. : : : : :