Okay, just in case you might want more choices, here's a link to a vendor that has quite a few gold tiaras. I've seen some of this designer's styles firsthand and their tiaras are very good quality. They have a whole page of gold ones without pearls:
Princess Bride Tiaras
One way we narrowed down the choices for Kate was to place the picture of the tiara on top of the picture of the dress, to better visualize how they would look together. For instance, here's how Princess Bride Tiara's 42B (my personal favorite with your dress) would look:
I like the way this tiara resembles the vine design on your dress. There is jewelry that coordinates with it too. You could do a pic layover with all the tiaras you find that you like and then narrow your choices from there. HTH! ~Ev