It's true Mary wore the ruby parure before her marriage. I think she wore it to the pre-wedding dinner. What I was getting at is that Mary took the tiara and jewels and changed it a bit to fir her particular style and taste.
I don't think Catherine need to prove anything but as she is HRH The Duchess of Cambridge, married to the second in-line to the throne and is a senior member of the royal family, it would be nice to see her in the jewels that goes along with her status. That's all I'm saying. I'm sure when Catherine attends a State Dinner or Banquet, we will find out if the Queen have given her The Royal Family Order of Queen Elizabeth II, which is an honour that has been given out to Anne, Camilla, Sophie, Duchess of Gloucester, Kent and Princess Alexandra. It's a pretty nice badge with diamonds.
It'll be nice to see Catherine wear the jewels that help represent her status.