A few years ago we discussed the wedding jewels worn by Princess Augusta of Cambridge at her wedding in 1843, and discovered that the newspapers had 2 distinct versions: one claimed she wore a sapphire tiara, the other that she wore a diamond tiara given to her by Queen Adelaide.
One discussion
http://members2.boardhost.com/royal-jewels/msg/archive/1467199812.html As I was looking through my notes from Queen Victoria's journals today, my attention was drawn to the Queen's description of the jewels.
Queen Victoria stated that the bride wore a "wreath of orange flowers & myrtle & a little diadem at the back of this."
In the journal Queen Victoria had a sketch of the bride showing that her hair was piled high at the back of her crown with the "little diadem" positioned in front.
So it seems that the papers which claimed Princess Augusta wore a diamond tiara were correct, as I am sure that, if the tiara contained sapphires, they would have been mentioned by Queen Victoria. Certainly, the Cambridge sapphire tiara could never be called a little diadem.