The bracelet is created from folded figure-8 shapes cut from leather or rubber. You can easily draw it yourself, or download this image and print it out ~1 inch wide (or trace the screen!):
To create the bracelet closure, cut out two special pieces with elongated tabs as shown:
Next up is the transistor. Splay the leads away from each other, and use pliers to carefully bend them into place. Pictured above, the flat side of the transistor faces the same way as the flat side of GEMMA. Solder the base and emitter pins, being careful not to singe the material of the bracelet (although black leather can be very forgiving in this regard).