Moonstone is the birthstone of Kark (Cancer) Rashi in Vedic Astrology, and according to Western astrology, it is for June. It heightens the moon's cosmic energies and brings a balance of body, mind and soul. 

Weight:     Typically, the gemstone size should be approximately 1/10th of your body weight, that means 1 carat for every 10 kgs. Alternatively, it can be according to the strength required as per your horoscope or as advised by your astrologer.
Quality:    For the best astrological results, any natural white Moonstones are considered optimum.
Metal:     Silver, and gold in some cases. 
Finger:     The little finger of the left hand for women and right hand for men is our recommendation. 
Day:        Monday
Time:        Morning 
Mantra:    'Om Chandramase Namah' or 'Om Chandrama Devataya Namah'
 

Benefits                          
Moonstone helps control anger and be calm. It enhances intuition, helps recover business losses and smoothens partnership issues. It is recommended for people in the creative field. 

Personality: It brings about a calm and composed demeanour and a strong sense of discipline and stability. 
Prosperity: It builds the path to wealth and respectability in society with positivity and good health.   
Aptitude: It helps encourage creativity and an artistic flair associated with imagination
and originality. 
Well-Being:  It helps in cooling the excessive heat created in the body and thereby
manages mental fatigue and over-exhaustion of the heart and brain. 
Relationships: The moon is associated with motherhood, and wearing a moonstone supports maternal relationships. 

It's a traveller's gemstone and ensures their safety, especially during water route trips. Like Pearls, this too helps in strengthening bonds with one's mother. Hence, it is recommended for artists and people in the creative field.
 

The glossy translucent lightning line on its surface called the Schiller effect is essential to determine a Moonstone's astrological value.A good cut with elegant dimension, carat size, perfect glow follow next. 

Moonstone comes in varied opaque colours like yellow, pink, orange, green-brown, grey, and colourless. They are found in Amenia, Australia, Austrian Alps, Mexico, Madagascar, Myanmar, Norway, Poland, India, Sri Lanka, and the US.