Quartz is the master healer.
A single quartz crystal carried on ones body will assist in maintaining balance, energy and protection.
All of the psychic abilities can be stimulated and amplified using quartz. It has the property of retaining calmness and clarity in every situation, decreasing negative energy that could inhibit emotional stability. It aids in perseverance and patience.
Quartz responds extremely well to the heart chakra and the third-eye chakra. In the heart chakra, it helps to clear emotional disturbances, enhances the states of self-help and self-love. In the third-eye chakra, it enables one to focus more clearly with the mind to empty the mind. It also promotes reflection, magnification of images and thoughts. Quartz, when used for the crown chakra, produces a spiraling effect that remove the Kundalini for access to the spiritual realm. If one has not overcome personal will and open the crown chakra it can produce disruptions in the emotional, physical and spiritual centers. Quartz can direct ones materialistic energies towards the spiritual realm. Quartz cancels harmful effects of radiation and radioactivity.

 

Opal amplifies traits, whether those traits are good or bad, and brings characteristics to the surface for transformation. It enhances self worth, confidence and self-esteem, and helps you to understand your full potential. It also brings lightness and spontaneity. The stone is said to help stimulate originality and dynamic creativity, encourages an interest in the arts, and aids in accessing one’s true self. Because the stone is absorbent and reflective, it helps you to pick up thoughts and feelings, amplify them, and return them to their source. It is a karmic stone- it encourages putting out positive emotions and teaches that what you put out comes back to you. The opal is also a representative of justice and harmony, and is a protective stone in dangerous places.
Opal has always been associated with love and passion, as well as desire and eroticism. It is a seductive stone that intensifies emotional states and releases inhibitions. It can also act as an emotional stabilizer. Wearing an opal is said to bring about loyalty and faithfulness.
Opals have been said to be extremely beneficial in many physical realms as well, such as in treating infections and fevers. It is also said to help strengthen the memory. Furthermore, it purifying blood and kidneys, regulates insulin, eases childbirth, and alleviates PMS. It is also beneficial to the eyes, especially as an elixir. Overall, the stone is said to be the most useful in preventing bad health. It strengthens the immune system and helps the body be resilient to infection.
Opal has also been known to help those who are suffering from chemical dependencies. The stone gives the wearer strength and the ability to take back control over their lives.

Smoky Quartz is helpful for those with cancer as it draws negative energies out of the body. Smoky Quartz is also known for its strong ability to absorb and ground negative energies out of the body, and into the earth to be transmuted. These properties make Smoky Quartz a great support crystal for those undergoing chemo and radiation therapies. 
As a healing stone, Smoky Quartz aids in the proper functioning of the adrenals, the kidneys and the pancreas. It has a relaxing effect, helping to block negativity, and aiding in meditation. It also helps develop ones latent abilities as a Channel, or Medium.
Smoky Quartz stimulates and purifies the base Chakra and stimulates the movement of Kundalini Energy by channeling the white light energy of the Crown Chakra into the First Chakra.
It is believed to help one come to terms with their own circumstances, becoming more acceptant of their own bodies and lives. It helps us to make our dreams into reality. It stimulates pride, self respect and self esteem. 
Smoky Quartz is especially useful for grounding and draining away negative energy.

 

Garnet is known as the stone for a successful business. If your business is not as good as it should be, just put 3 or more garnets on your desk. It is believed that if a garnet is put under a pillow it will cure depression. Garnets can be used to make a person popular and have self-esteem when worn as jewelry. It helps protect one on trips. Garnets bring constancy to friendships. Garnets are also known for stimulating success in business.
Garnet comes in many colors, but now we will speak only about red Garnet. The Garnet is associated with the thyroid and spleen. It helps cleanse and purify both when held over the area. The Garnet is usually held in the hand or placed on top of the head when searching or meditating on past lives. Information that is beneficial and helpful will usually be released for the searcher.
Garnet is a stone of purity and truth as well as a symbol of love and compassion. The information released in a search may be painful, but it will always be what the searcher needs. The Garnet will help everyone's security level and spiritual awareness.