I do hope The Queen's Diamonds does tell us about the brooch worn by Queen Mary above the Cullinan brooch.
--Previous Message-- : : My source is the 2 volume The Crown Jewels : of 1998, which I used before in this thread. : : Queen Mary's Crown was made by Garrard & : Company with nearly 2,200 diamonds for her : coronation in 1911. : Today the crown on display has rock crystal : replicas of the Koh-i-nûr and Cullinans III : and IV. : The Koh-i-nûr was set on the front cross, : Cullinan IV in the front centre of the band, : and Cullinan III in the cross paty above the : monde. : I don't think the Koh-i-nûr in 1911 included : its "oval frame of small rose : diamonds". : That frame was included for Queen : Alexandra's, and it's replica was added to : Queen Mary's in 1914 with the replica : Koh-i-nûr . : For the 1937 coronation, the Koh-i-nûr was : replaced by Cullinan V in its "delicate : platinum and diamond surround". : I have not found what was used to replace : Cullinan IV on the band (see pic). : : "Garrard received payment for the Crown : from Queen Mary's Privy Purse; no record of : its materials and cost is available, though : the Queen probably followed the example of : Queen Adelaide and Queen Alexandra in using : stones broken out of family jewellery. The : majority of stones are old-fashioned : cushion-cuts." : Queen Mary did not meet the cost of the work : done in 1914. : : :