I used that exact tiara as the jumping off point for a design I did for a figure skater's competition dress this year. I am the queen of the Swarovski crystals!
Duchess of Verona, Did you hand sew the Baden Tiara design?
No, I apply the stones with a special glue called E6000. Once they are on they don't come off. Hand sewn, if a thread snaps, you
are in trouble because the stones will fly off when the skater spins. There is also something called hotfix. It has a special heat sensitive glue on the back of the crystal.you pick up with the heated applicator let the glue melt for 7 seconds and apply to the dress. But it does not hold on as well on stretchy fabrics. And it takes much longer. Last year my daughter's dress had Queen Mary's Stomacher Brooch on the front of it.