For this vital decision of their lives, the parents of both the girl and the boy who are to get married and the elders of their families get together; they then follow an ancient method, laid down by the sages of old, to see the marriage compatibility between the girl and the boy. This method is called ‘Porutham’ or koota agreement.
Poruthams are chalked out after the study of the birth stars of both the boy and the girl who are contemplating marriage. The sages had initially devised 20 poruthams but now only 10 are in use. According to them, there are 27 birth stars (nakshatras) for each person in an oval configuration which constitutes a zodiac. The zodiac influences the person through the nine planets (navgrahas).
There are two theories on the use of gemstone for astrological purpose. The first is based on the principle of enhancing a particular ray or color effect where the gemstone acts like an amplifier. The origin of this idea can be traced back to the Rig-Veda, where humans are advised to use the seven gems to gather the rays of the Sun onto our body. The second theory envisages that the gemstone acts like cosmic filter, preventing harmful rays from affecting our bodies. Diseases are caused in the body due to deficiencies and the use of certain gemstone supplement the deficiencies, which results in improvement of health, mood and life force.
The 10 poruthams (kootas) thus chalked out are: dinam, ganam, yoni, rasi, rasiyathipaty, rajju, vedha, vasya, mahendram and stree deergham.