In the previous post, Kate wore this large, stone-studded ring.
Here is the close up:
It appears to be a silvertone or silver metal chunk studded with white rhinestones (or some other stone) and colored stones. It’s hard to see, but it might have some floral design on some parts of it. The centerpiece is attached to a clear plastic ring (you can see Kate’s skin color through it). I think this is costume jewelry.
I didn’t include these particular photos in the Boodles Boxing Ball 2008 Crystal Mesh Earrings post, but they do show that Kate wore this same ring to that event.
It’s on her right hand.