Wearing a coral gemstone, also known as moonga gemstone, is believed to have various rules and benefits according to traditional gemstone lore and practices, particularly in Vedic astrology and Ayurveda. Some commonly cited rules and benefits associated with wearing a coral gemstone.

Rules:

1. Selection: 

It is advised to select a high-quality natural coral gemstone for astrological and therapeutic purposes. Synthetic or treated corals may not carry the same benefits.

2. Placement: 

Coral gemstone can be worn in a ring or pendant. It is often recommended to wear it on the ring finger of the right hand for males and the left hand for females. However, this can vary depending on individual astrological charts and beliefs.

3. Time: 

There are auspicious times recommended for wearing the coral gemstone, typically suggested by astrologers based on the wearer's birth chart. It's believed that wearing it during specific planetary alignments can enhance its benefits.

4. Purification: 

Before wearing this gemstone, it is often recommended to purify it by dipping it in milk or Ganga Jal (holy water) to remove any negative energies associated with it.

Benefits:

1. Astrological Benefits: 

Coral is associated with the planet Mars (Mangal) in Vedic astrology. It is believed to enhance the positive effects of Mars in one's horoscope, thereby promoting courage, vitality, energy, and leadership qualities.

2. Health Benefits: 

It is believed to have therapeutic properties in Ayurveda. It is thought to improve blood circulation, boost energy levels, and alleviate conditions such as anemia, asthma, and menstrual disorders.

3. Emotional and Mental Well-being: 

Wearing coral is said to promote emotional balance, reduce stress, and increase self-confidence and determination.

4. Protection: 

It is believed that coral can protect the wearer from negative energies, accidents, and psychic attacks.

5. Relationship Benefits: 

Some believe that wearing coral can strengthen marital relationships and promote harmony within the family.