UPDATE: This bracelet is from Butler and Wilson.
This bracelet made an appearance in September 2009, when Kate hosted a table at a charity auction in London.
Here is the closeup:
This appears to be a
six point star daisy flower bracelet with sparkling clear rhinestones or cubic zirconias studded all over the stars. It closes with a spring or lobster clasp on an adjustable chain. I believe this is costume jewelry.
I will try to locate a bracelet that could replicate this one.
If anyone finds one, please contact me.
Thanks to My Small Obsessions for the ID. This is the Butler and Wilson Daisy bracelet.