Gems or Ratnas or Manees are beautiful stones with a large variety of colours arid high density. Their luster, transparency, rarity and stability have attracted people since time immemorial. Some of these are precious, while others are not so precious but rare all the same. Different gems are found in different parts of the world. India is one of the richest countries in gems. Among gems, some are transparent, some translucent, while few are even opaque.
In ancient India, gems were stored as part of the treasure of kings and nobles because of their precious nature. It was quite late when gems found its usage in ornament and very lucrative business was started for the same. The earlier mention of gems for astrological remedies was found in Rishi Parashar's "Brihat Parashar Hora Shastra", Varah Mihir's "Brihat Samhita", in Bible, in Greek Literature and in other advanced cultures as well.
The ancient Ayurvedic researchers studied healing properties of gems and found that they created different effects on the human body. Gems are basically perennial source of concentrated and purest form of particular colour. The studies and experiments of our seers paved the ground on which use of precious and semi precious gems for Ayurvedic medicine as well as astrological remedies to ward off evil planetary influences are based. All gems and precious stone carry the energy of planetary power of nature and the blessing of super souls of sages and seers.
The human body is composed of different group of cells. In turn each cell is composed of cosmic rays. To remain in healthy condition, the rays with in cells should be in a state of equilibrium. Harmony may be disturbed either by the outward or inward action of a person manifesting into a disease. Cells and tissues can be gradually strengthened with colour therapy in the form of gems. Natural gems radiate cosmic rays or absorb them as per their nature due to cohesion under tremendous temperature and pressure with in the earth's stratum. Hence the frequency of cosmic rays corresponds mathematically every time with the affected group of cells.
Once the diagnosis has been made for a particular disease, the therapy is usually administrated through Ayurvedicqem medicine or by wearing gems in the form of rings, amulets or pendants. The influence they exert on a native depends on the different colours emanated or absorbed by a gem. Like wise each planet rules over or is related to a gem. The colours of the planet in the form of rays are reflected on the human body through the gems and create an effect by absorption or reflection. The gem acts as fine filter and produces good or evil effect. If planets are sending unharmonious vibrations, the gem to protect the native will absorb the same.