An interesting list Frank, the wedding gift of the uncut diamond I believe was cut and named after the giver, that being a Dr. Williamson, namely the Williamson pink diamond brooch. The gifts the Queen received in her diamond jubilee year such as a box of precious stones from the President of Namibia, if I'm not wrong I think they would be classed as personal gifts rather than official gifts. The many collect necklaces mentioned I believe are mostly repeat necklaces worn by the preceding Queens and may not be as many as believed. QM was known to lengthen and shortened necklaces from loose stones in her keep and I'm sure I read somewhere that Camilla the DoCorn had done the same at one of her birthday parties. Would I love to view the 5 tire necklace with pearl pendants and also the 5 stand necklace. The Queen tends to be unfussy when it comes to outing substantial elements of her jewelry collection though.
Regards,
Dave.

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What an amazing list Franck!!
Collecting and collating all this information must have taken a long time! Thank you so much!
There are a few items which I think we may have seen. I will highlight what I know/think under separate headings, so that everyone can comment, as I may be wrong.