I put all of the gemstones and crystals into a Himalayan Pink Salt water solution in a glass bowl. I left it outside to let the late afternoon sunlight charge the crystals as well.
Note that it's more recommended to use glass bowls instead of anything metal. Also to not charge the crystals in the middle of the day because the intensity of the sunlight could fade or slightly damage certain crystals. Early morning or late afternoon sunlight is fine. Moonlight is another way to charge.
I left it out for about 4 hours to charge in the salt water solution and sunlight. The amount of time is really up to how long you want the crystals to be charged.