Everything in the universe seen or unseen has its own unique vibration frequency, including stones! Each stone resonates with a healing property unique to its particular variety. For instance: Shungite raises the frequency of the wearer's own vibration to strengthen the individual's ability to ward off negativity. It's a stone of protection.
Moldavite is a truth stone and the ultimate stone of transformation as the wearer becomes 'uncomfortable' if they are not telling the truth. It is quite literally a stone that comes from the heavens!
Moonstone is a gazing stone that helps one dream and is also said to decrease one's appetite. There are literally hundreds of stone crystals to choose from!
Many blue stones like Blue Lace Agate or Larimar are associated with the throat chakra and are perfect for people that need their voice heard or their throat healed.
These are only the briefest of descriptions. There are many, many books that detail various aspects of each stone. The internet is also rife with details of the healing properties of each stone crystal. Describing them all would be quite a tome!
Rose Quartz stimulates the heart chakra & helps sharpen one's sense of intuition. It is also said to attract more romance into your life!
Herkimer Diamonds, the highest vibrating variety of the Quartz family, increase the vibration of all the stones near it.
Onyx is a stone you want to give someone recovering from illness or surgery as it aids in recovering strength & stamina.
Ruby is said to boost self-confidence & stimulate organ health.
Turquoise is a stone of wholeness & truth. People that wear Turquoise see truth through compassion.
Citrine is said to increase metabolism, aid in weight loss, and stimulates playfulness and optimism.