Added a larger base hidden under the petals so the pendant lays flat on the chest. The base also has two holes to make a necklace with. The pendant would benefit from some smoothing, but I didn't have the time.

Printed with PLA, 30% infill, no supports, 0.4mm nozzle with 0.3mm layers, and I would have filled with epoxy. You'd probably want to print with smaller layers for less effort after it's printed. Jump rings are 6mm (under the flower), 5mm, 4mm, and 3mm in descending order, connected to a 1mm chain.

Original version from here: http://www.thingiverse.com/thing:1440472