I think it would depend on just how many elements were used in the tiara. There are at least 7, but could be 9, in which case the necklace theory would have to be revisited as there are only 8 clusters in the necklace.
--Previous Message-- : I believe that the colours in the photo of : Queen Alexandra posted by Barbara D are a : modern addition and are misleading. : : According to the Royal Collection and the : National Portrait Gallery UK the photo was : taken on 27 July 1889, on the occasion of : the wedding of Princess Louise, Duchess of : Fife. : : : http://www.royalcollection.org.uk/collection/search#/4/collection/2904795/alexandra-princess-of-wales-with-her-sons-prince-albert-victor-and-prince-george : : : http://www.npg.org.uk/collections/search/portraitLarge/mw131007/Queen-Alexandra?LinkID=mp00072&search=sas&sText=Queen+Alexandra&wPage=11&role=sit&rNo=221 : The NPG has at least 3 copies of this photo. : All have the same date. : : For the wedding Queen Alexandra wore a pale : gray dress and a sapphire and diamond tiara. : : Illustrated London News 31 July 1889 : : : : The Standard 29 July 1889 : : : The Times 29 July 1889 : : : I have previously argued that the central : elements with sugar loaf cabochon sapphires : in the tiara are from the necklace given to : Queen Alexandra by the Czar and her sister : for HM's silver wedding anniversary. : : Illustrated London News 17 March 1888 : : : The earliest date I have found so far of : Queen Alexandra wearing amethysts is for the : wedding of Princess Alice in February 1904. : :