Black Crystal is associated with the solar plexus chakra, and known as an excellent ground stone. Many believe it aids in relieving stress and anxiety, while calming a hyperactive mind. Black Crystal is also said to disperse fear and lift depression and negativity, while encouraging positive thought and action. Others associate the stone with detoxifying the digestive system, and protecting against radiation. 
Chakras - Base Chakra, Solar Plexus Chakra
Zodiac - Scorpio, Capricorn
Element - Earth/Air
 
Onyx is a stone recommended during times of pain and sorrow. It’s known for balancing male and female polarity and increasing hormonal balance. It’s also said to help with objectivity and making intelligent decisions. In addition, it’s believed to help strengthen one’s bones.
Chakra - Base 
Zodiac - Gemini, Leo
Element - Earth
 
Jasper is known as the “supreme nurturer”. It sustains and supports through times of stress, and brings tranquility and wholeness. Jasper provides protection and absorbs negative energy. It balances yin and yang. Jasper clears electromagnetic and environmental pollution, including radiation. It encourages honesty with one's self. Provides courage to assertively tackle problems. Aids quick-thinking and promotes organisational abilities. Jasper stimulates the imagination and transforms ideas into action. Prolongs sexual pleasure. It supports during prolonged illness and re-energises the body.
Zodiac - Leo, Virgo, Scorpio
Element - Fire
 
Jade is known as the dream stone, and is said to enable understanding of dreams. Jade is believed to beam love, courage, chastity, and wisdom. At the same time, it’s said to reduce negativity, and increase the ability to express oneself. It’s known to balance emotion, provide comforting energy, endurance, and peace. In addition, Jade is believed to help the body heal itself, increase flexibility, and strengthen the heart, eyes, kidneys, and immune system. The stone is also associated in aiding with mental problems, purifying blood, encouraging a long life. Jade is a 12th Anniversary gemstone.
Chakras - Heart Chakra
Zodiac - Aries, Taurus, Gemini, Libra
Element - Earth