I have also noted in my files that this brooch was a wedding gift to Queen Maud by Czar Nicholas II and Czarina Alexandra Feodorovna, but I do not remember the source of this information - and I do not have pictures of Queen Maud or Crown Princess Märtha wearing this brooch.
Queen Sonja wore it a few times in the past years, notably on 17th May 2014, in Eidsvoll, for the bicentenary of the Norwegian Constitution:
(Credit: Nigel Waldron/Getty Images Europe)
Queen Sonja also wore this brooch on 10th October 2012 for President of Finland Sauli Niinistö's State visit: