All materials can be purchased at hobby lobby, michaela, joanns, any kind of craft store really!
I use individual foam craft sheets. The thinnest ones, I believe there are two thicknesses, I always pick the thinner one. I use two sheets for the crown and one for the necklace.
I made a master crown and tiara shape by sketching it out on paper first, that way I didn’t waste foam. I always fold the paper in half so that I ensure it is symmetrical. I would play with it until you think it looks good, holding the paper up to your neckline and head.
Once you have the foam cut out and the shape you want it. Draw using a pencil the swirly designs. If you Google “aurora Disney parks crown” there’s some good reference images. Or you can use mine if you want 😉 I try to make the tiara symmetrical in design but the necklace pattern is more asymmetrical.
Using puff paint, fabric paint, or even elmers glue, carefully trace the pattern you’ve drawn. As well as all along the edges to give it that raised look. If you mess up you can wipe it off with a wet rag before it dries.
Let it dry for 24 hrs. Spray paint the front and back using metallic gold spray paint. At this point both pieces should be relatively flat, with the exception of the slight crease in the crown.
Once the paint is dry, add rhinestones. I use e6000 glue for this. I prefer the ab crystals but you can use whatever you want!
I usually let that dry for another 12 hrs or so. Finally, using hot glue I bend the crown around a headband just like a plain tiara. I also hot glue a 12″ gold colored chain to the necklace. The more glue, the more secure.