It has been said before that the Queen Mother did wear two very similar sapphire brooches, which, in itself, does not of course prove that one of them was her gift to Diana.
If only we could be told a bit more about the story of buying the sapphire. I suspect that the source provided the information to people in confidence, and the source could be a highly reliable one!
But the matching brooch might have been a sapphire bought by the Queen Mother, which she had made into a brooch and which she wore for some years before giving it to Diana!
I don't think we are going to get any further with this until a respected authority goes public on the matter.
--Previous Message-- : Of course, it is very hard to tell from only : pictures, but it does seem to me that the : brooches in the two sets pictures are : different brooches. The size of the border : is deeper and thicker in the pictures on the : left than that of the pictures on the right. : The size of the stone also seems different. : : I think QM had two large (but very similar) : sapphire brooches. :