For this you will need a watch. You can use an old watch by taking off the strap or you can buy the individual watch on it's own. Attach two large jump rings through either side of the watch.
Cut a length of jewellery thread long enough to fit around your wrist 3 times. Slip a jewellery clasp in to the middle of the thread.
Slip a large bead over both tails.
Slip a thin long bead on either tail.
Slip a round bead on either tail.
Slip another long thin bead on either tail.
Slip another large bead over both tails.
Continue this bead pattern until you have a bracelet long enough to fit your wrist. Slip a jewellery clasp on the end and knot the thread. Clip either end of the bracelet, the clasps, on to the jump rings of the watch.