That's because those little holes are where the brooch pin will go!
And here's the trial fit for the brooch pin...
You can also see the back detail a little more clearly and my makers stamp. I tried really had to come up with a bail that wasn't clunky but didn't like any of them - so now it's a brooch BUT I will be making a slider bail to fit over the brooch pin
Next I need to build up some PMC over the pin fittings and then the PMC part is done (except for the firing!)