I made Galadriel's brooch using a large glass dome pendant and worbla. The 50mm clear glass pendant was purchased from a vendor on Etsy, called WillowRunCrafts. The pattern I used as a guide was designed by Jakcosplay and the free download is linked to her youtube tutorial.
By looking at the drawing, it's difficult to see in which order the maze of various leaves and sticks lay, let alone the individual shapes. So to make things easier, I taped the pattern to a widow and traced the individual pieces to a blank sheet. I then assigned numbers to each piece so that I would know exactly where they all go. I then cut out all the pieces that I transferred to the blank sheet and traced them onto the worbla.
In the movie, it looks like Galadriel's amulet has a cream color, maybe even goldish hue to it, so I painted the back of the glass gold to give it that effect.
Now for the really fun part! I had to heat a long strip of worbla and roll it out to make super thin sticks (or as my husband likes to call them, "skinny snakes"). This process requires patience with reheating, rolling, repeat... Eventually, you'll get there, although the balls of your hands might get sore from all that rolling. Pictured below is how skinny I mean.
You will use this long super-skinny stick to outline around the glass circle and make all the vine-like embellishments (basically, anything that's not a leaf will be a stick). Once you place all the pieces in the correct order, heating as you go to make sure they stick together, you should accomplish something like this.
Using care, gently remove the worbla piece from the glass; it should come off in one piece. Then give it 3 or 4 coats of wood glue, or mod-podge, to smooth it out and prepare it for painting.
To give it the most realistic metal look, I used liquid leaf paint in silver. Make sure you're in a well-ventilated area when doing this since breathing the fumes are just as hazardous as spray paint. Only paint the front for now if you want to stick more worbla to the back to encase the glass pendant.
Now you can place it back over the glass pendant, heat some more worbla and stick it along the backside to secure the pendant. Or if you're like me and don't trust the worbla to hold it, you can mix up some epoxy and coat around the edges of where the worbla and glass meet. Once everything has cured, you can use more epoxy to glue a pin to the back if you wish.
In addition to the back pin, you could use some clear fishing line and sew it around some twigs to better distribute the weight upon the lace and to make sure the lace doesn't tear from the weight.
I hope you liked this tutorial! Please check back often for more.