Butterfly Traveler's Notebook Planner Charm with a dangle of purple crystals and a purple enamel butterfly charm at the top.

Available in two styles - The ring bound style has an extra bit of chain to make the charm drape over the spine of a ring bound planner. It is usually 1 to 1 1/4 inches longer than the TN option.
The travelers notebook style has the clasp right at the top of the charm. See the measurements below.
    
Charm Length (not including clasp): 4 1/8 inches
Traveler's Notebook Style Charm Total Length: 5 1/8 inches
Ring Bound Style Charm Total Length: 6 1/8 inches

Shown on Personal Sized Planners.