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Elizabeth II, George VI and George V were crowned with St Edward's Crown.
Elizabeth II and George VI, and I think George V, wore it until the Recess after which they emerged for the final procession wearing the Imperial State Crown.
Victoria and Edward VII were both crowned with the Imperial State Crown and emerged wearing it. Edward VII had been ill and the lighter crown was used for him.
Working from memory I got a bit wrong. Now that I have found my proper source, re Elizabeth II -
"She was the only sovereign in modern times who had sustained the heavy Crown of St Edward from the crowning to the end of the ceremony except during the Communion - even her father had exchanged that heavy burden for the much lighter Imperial State Crown at this point of the Service. "
Sovereign and Consort are bare headed during the Communion.
So I await with great interest to see what King Charles III will do.
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