Black Onyx is a popular gemstone that is believed to have several physical and emotional benefits. Here are some of the most commonly cited benefits of black onyx:

1. Protection: Black Onyx is believed to have protective properties that can help ward off negative energy and protect against psychic attacks.
2. Grounding: Black Onyx is also thought to be a grounding stone that can help you stay centered and balanced, especially during times of stress or uncertainty.
3. Focus: Black Onyx is said to promote mental focus and concentration, making it a good stone to use when you need to stay focused on a task or project.
4. Healing: Black Onyx is believed to have healing properties that can help with physical ailments such as joint pain, headaches, and backache.
5. Emotional stability: Black Onyx is said to help promote emotional stability and balance, and can be particularly useful for people who struggle with anxiety or depression.
6. Self-confidence: Black Onyx is also thought to boost self-confidence and self-esteem, helping you feel more empowered and in control of your life.

Chakra: The Root Chakra

黑瑪瑙又叫長壽之石，具促進幸福及富足之效，能招好運降臨、舒緩壓力、加強膽色與勇氣、減低戾氣、嫉妒及沮喪。

黑瑪瑙可消除恐懼，讓人產生安全感，並且玉石可辟邪並防止低靈及負能量的侵擾，是居家、事業防護的寶石。

黑瑪瑙可增加人的自信心，避免恐懼不安，遠小人近貴人，不至於在複雜的環境中迷失方向。

喜愛佩帶黑瑪瑙的人未必擁有過人的美貌與智慧，未必擁有天然的親和力與好人緣，但其性格中與生俱來的「稜角」卻是一種足以致命的誘惑。

黑瑪瑙一般呈透明到不透明，自古以來一直被當做辟邪物、護身符使用，色澤未達全黑者，具有夢幻的同心環帶狀、層紋狀、波紋狀等各色形態的美麗花紋，這些千奇百幻的天然玉石紋路正是黑瑪瑙最大的藝術特色，其花紋的顏色多種多樣，有白、灰、黃褐、黑等。

對應脈輪：海底輪