Agate stone is known to rebalance and harmonize the body, mind and spirit. It is also known to cleanse and stabilize the aura, banishing negativity. Agate is believed to stimulate and strengthen our analytical capabilities, encouraging us to think clearly and concentrate upon the task at hand. It’s also believed that the stone allows us to gain inspiration from spiritual worlds.
Chakra - Crown Chakra 
Zodiac - Gemini, Virgo 
Element - Earth

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.
In addition to the generic healing properties of Onyx, specific colours and types have additional attributes:
Black Onyx is associated with our Base Chakra.
Green Onyx is associated with our Heart Chakra.
Zodiac - Gemini, Leo 
Element - Earth