Also called ZigZagging Cellini spiral
I did the fatter part first then decreased at each end to do the narrow part until the desired length was achieved.
If I was to do this again I would do the narrow part then 5 or 3 sections of the larger section as a focal point.




Materials:
3mm Czech Fire Polished Beads, Bronze Metallic
8/O Seed Beads - Miyuki Transparent Matte Emerald
11/O seed beads:
Japanese Transparent Olive Green
Czech white
Miyuki Delica Transparent Emerald Green (in decreased area replacing Matte Emerald)
Czech Bronze Metallic (in decreased area replacing bronze fire polish)
15/O Seed Beads
Miyuki J34M5 - Transparent Kelly Green
Miyuki J4105 - Crystal Clear Transparent Iridescent

- excellent step by step instructions for the fatter - larger part by Yvonne King AKA My_Amari: http://www.craftsy.com/pattern/jewelry/bracelet/alternating-cellini-spiral-bead-bracelet/39934