The headscarf pin used here is two silver balls suspended from one silver pin. (It may be two pins, but the way the balls move suggests they are attached.) The pins sparkle when Rayyan moves but I'm not sure if they are very shiny ball or have crystal embellishment. I have never seen this style before, let's see if we can find something to copy it with. If you would like an identical pin you could make it yourself at your local bead store or commission someone else. The alternative is to tie your hijab in such a way that it does not require a stick pin to stay in place or use your own outfit appropriate pin.
Here's a pin you could use, Everything Islamic Rhinestone Crystal Ball Hijab Pin £3.20 Use silver pins two to copy the style exactly or try pink if it matches the pink you are wearing.
Or try this one if what you like is the double embellishment
It's a Pin Thing Czech Glass Crystal Drop Hijab Pin in Pink £2.99