Thanks Bryce. I agree that the bridesmaids wore the clips on their right shoulders. What I was hoping for is that someone might have seen the adults wearing their presents on other occasions, and hopefully that might have given us a good view of the jewels.

Now that you have drawn attention to what I thought were shadows in the dresses of the then Princess Elizabeth and Lady Mary Cambridge, it does look as if they too wore their gifts, but I suspect their brooches were probably scaled down versions. The image below is slightly clearer.