There are many pearl and rhinestone headbands on the market. It strikes me that one could use these as starting points for a do-it-yourself tiara. Sewing and craft stores sell various pearls, stones, beads and wire. Combined with the knowledge you have here about materials and techniques and with a little practice, I imagine that one could create some nice tiaras.
Many of the professionally made tiaras feature a good deal of exposed wire work in the design, and some are called "wire" tiaras, so instead of hiding it, you may want to flaunt it.
When I was just a little girl, I saw and was fascinated to no end by a lady who made tiaras. She worked with the lengths of set rhinestones on links. She would start by making one tiara, soldering the loosely linked stones into a rigid set of elements, then joining them. Using this, she made a mold in plaster of Paris by mixing it and while it was soft, putting the piece she made in it and removing it once the plaster had hardened. Then, by laying the lengths of linked stones in the grooves of the mold and soldering the loosely joined stones and then joining the elements as with the first, she could make many tiaras of the same design. I thought I might take that up but found the lack of intense activity boring, besides which it took too much time away from my more profitable activities: Sort of like raising tabbies when you could raise war kittens.
t is implied by the very existence of theTiara Subroutine which pertains to evaluation and more so to design and, since we have the publication that includes instructions for making tiaras as well as the Resources; places to get things, that it goes without saying that a page about Do-It-Yourself is in order soemewhere.