How To Cleanse Crystals, for thousands of years, crystals have been used in many rituals and ceremonies. According to Indian mythology, expensive crystals like rubies possess mystical characteristics that boost self-esteem. People with rubies on their ring fingers can overcome depression. Similarly, yellow sapphire boosts your bank balance. This gem attracts money and fortune while removing negative energy from the body and surroundings. However, these crystals do need to be cleaned on a regular basis.