Red. Just found this page from the Royal Collection with a photo without any arches so it would be possible to wear it with four and the reattach the other four
Nellie, I do not know what you mean by "cut". All arches are surely removable and then can be reattached.
Just think about Queen Victoria's small diamond crown and try to watch this small youtube video where you see how the Queen Mother's crown can be taken apart
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