Melt wax in a double boiler using a thermometer. Once it has reached the right temperature for adding dye and scent (refer to your wax instructions), add in the pink crayon and stir until completely dissolved.
Add in the essential oil blend. Stir well to combine.
Place the 3 wicks around the base of the candle. Secure each wick to the base with wax adhesive or hot glue.
Cool the wax to 140°F and pour into the tin. Leave 1/4" of headspace to leave enough room for the tin to close with the crystals.
Let the candle sit untouched and set so that the crystals don't slip into the wax. It should be slightly warm to the touch. Gently press each crystal into the wax but don't push too hard or you risk cracking.
Allow the candle to harden, then trim wicks to 1/4". Light and enjoy!