Crystals were made and currently are set into the crown. However, a lot of mixing and matching used to go on, and not only transferring the Koh-i-Noor from Queen Mary's crown. Because of size similarities, Cullinan III and IV could substitute the Lahore and Turkey. I have read that, when Queen Elizabeth wore the crown (minus the arches) at the 1953 Coronation, it was set with both the Koh-i-Noor and the Cullinan IV.
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