one strip of fabric about 2 inches wide by 10-15 inches long
a glue gun
Start off by folding your piece of fabric lengthwise with the right sides facing out. Then roll the end a few times to form the center of the rosette. Apply glue to help it keep it’s shape
Next start folding or twisting the fabric as you wrap it around on itself stopping to glue every once in a while so that it stays secure. You will get a different look depending on if you fold or twist. I think both are pretty it is all a matter of preference and you might find that you like different techniques for different fabrics.
Once your rosette is to your liking cut your fabric so that there is just enough left when opened up to cover the back of the rosette. Glue that down. Trim any excess that might show from the front.
Add some glue to your pendant bail then string it on a chain and you are good to go.