The service of Coronation of King Charles III is on 6 May 2023 at Westminster Abbey, London.
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It has now been announced that Queen Mary's Crown will be modified to be used for the crowning of the Queen Consort and that Cullinans III, IV and V will be set in the crown.
Some of the story of those diamonds has been redisplayed here (from the Royal Jewels Lists forum now suspended). I think it makes a useful starting point for more discussion of those Cullinans and how they will be used.
In particular I would hope that Cullinans III and IV which form what has been known as the Cullinan Brooch will, in the future, still be capable of being worn again as that brooch.