Gemini
Ka, Ki, Ku, Gh, I, Ke, Chh, Ko, Ha
The persons of Gemini zodiac signs are addicted to studies and are skilled workers. The Mercury chiefly affects mind, speech, and profession. Persons of this zodiac sign are speech perfect, humorous, and intelligent. The master of Gemini zodiac sign is the Mercury, therefore, persons of this zodiac sign should wear the following gems or sub-gems:

Gem: Emerald
Sub-gem : Onyx, Torquoise, Aneinterni, or Green agate.

Emerald
Emerald is a representative gem of the Mercury .It is known by several names-haritmani, markat, panchu, panna, etc. It is green. It is an ancient, popular, and precious gem. It occupies third place in the class of precious stones.

Birth of Emerald
Emerald takes birth in cracks and piles of layered rocks besides being found granite and pagmatite rocks. Its chemical composition includes potassium, sodium, letheum, cicium, etc., alkaline substances. In India, emerald is found in Ajmer, Udaipur, Bhilwara and Chatarpur. Abroad, it is found in Pakistan, Africa, America, Brazil, Colombia, Medagascar island, and Siberia. Colombian mines are famous for good quality emerald. The second quality emerald is found in Russia and Brazil. Emerald is often both transparent and non- transparent. There is often a slight net in a transparent emerald. It is difficult to get flawless emerald, and it is beyond a common man's means to buy a flawless emerald due to exhorbitant costs.

Attributes and Advantages of Wearing
Emerald cures eye diseases and fever. Besides, it is also helpful in asthma, swelling, etc. , and enhances physical vigour and semen. Its speciality is that it eradicates all the Mercury-related faults. Wearing it helps curb, control) and pacify playful mental attitude and begets mental peace. It helps heart's attention, pacifies sexual desires and anger, and begets exquisite happiness and peace. It is for this reason that the Christian clergies and priests wear it.