The crystals used here are the ruby and moonstone.
Moonstone is associated with the moon, wisdom, and flow. It represents cycles and balance. Strongly influences psychic and intuition abilities, as well as calming the mind. Aides in soothing and balancing when the environment around us is chaotic.
Ruby is a gemstone known for passion. It is regarded for balancing emotions and increasing emotional awareness. Enhances sensuality and helps with good fortune aiding in balancing the body, mind & soul.
The crystals associated with Cancer are moonstone, calcite, opal, angelite, ruby, rhodonite, celestite, halite, gold obsidian, lilac amethyst, rose quartz, green aventurine, carnelian, smokey quartz, shungite, pearl, emerald, amber, & bornite. There are more crystals associated with cancer not listed here.
