Certainly looks like a pair of clips - which I am now hunting for.
Edit: more than once in the past I have posted pics of brooches donated, to the British Red Cross for fundraising, by Queen Mary and the Queen Mother (I think). I always have trouble finding the darned things again. I'm sure there was a pair of clips among the donations. Perhaps someone else can find them.
--Previous Message-- : Wow! Thank you, Joye. This brooch worn by : Queen Mary is unknown to me. It looks like a : double-clip brooch, with a large central : diamond connecting the two clips. I do not : remember any brooch of any of Queen Mary's : descendants looking like this one. : : Here is another screencap, from the same : video: : : : : :