The Gold BH 3.3 French Dip Chartreuse from RIO is a chartreuse gold bead-head nymph tied in size #14. The gold bead-head helps it sink quickly into the feeding zone.
A competition-style pattern meant to be fished deep. The heavy bead and slim body drop it fast and keep it in front of the fish, where trout do most of their feeding. Carry it in a couple of weights to adjust to changing depths through the day.
The 3.3mm bead gets it down into the feeding zone in a hurry.