Since ancient times people with great respect for the powerful and mysterious forces of the stones. They are endowed with magical stones, and healing properties – so there were amulets and talismans. For the first time the characteristic of the amulet gave the Roman scholar Gaius Pliny the Elder (77 BC) in his “Natural history.” He believed that the amulet protects him from poison, from harm, gives him supernatural powers, reflects the spell.

The ancient civilizations of India, China, Egypt, Greece, Rome believed in the close connection of man with nature and, especially, with stone, because the stone is as much an integral part of nature as plants and animals, but the world of stone is much older than the living world.

Ancient Greek scientists – Plato,Herodotus, Theophrastus in his works paid much attention to magic and healing properties of gemstones.
  Aristotle wrote a book in which legends about stones used in medicine were collected. Well-known scientists of Ancient Rome also devoted their scientific treatises to gems and their magical properties. This was written by Guy Pliny the Elder and his contemporary Dioscorides. That's what the medieval scholar, philosopher, poet Marbod Rensky said in his "Poem about gems or precious stones":

“Everyone knows that the doctor help the stones
From the human body to expel pernicious ailments.
Know also that stones are the cause
All the best, giving those who must wear them.
Let no one divit – doubt is misplaced,-
In precious stones lies a magical power.
In the grass she is and rocks it only stronger”.

In the middle ages the Christian Church was forbidden to wear amulets and talismans, believing their diabolical obsession. But to deal with this was very difficult: after all, the belief in the magical power of these objects is rooted in pagan rites. Faith in the miraculous power of the stone was accompanied by a man at all times. And still people buying semi-precious stones, I hope that those will help them to alleviate the suffering, relieve pain, become happier. The astrologers tried to link the magical properties of gems with the position of the zodiacal constellations on the celestial sphere.
There are several options for the distribution of "patron stones" for the signs of the Zodiac, proposed by various astrological schools. Currently, there are various versions of translations of ancient treatises, which describes the magical and healing properties of minerals. There are tables of the "lucky stones" of the month, based on the data of ancient literary sources: "The Bible, the Book of Exodus," "The Bible, Apocalypse," "The Chestpiece of the Byzantine Bishop Epiphany," "The Prophecies of the Delphic Oracle, collected from Herodotus" and others. But we must take into account that the compilers of these translations and tables, often without knowing the gemmological terminology and gemmochronology, use the names of stones that do not always correspond to the described time.

International jewellers Association (IBA) has carefully studied all the existing lists of stones-talismans from drevnepersidskih to modern, and published a corrected list.
The national Association of goldsmiths (NAYA) the UK believes that every month of the year has its own color and it matched stones of similar color.

Jewelry stones, according to the recommendations of the IBA and NAIU, are arranged in the following order:

January garnet dark red
February amethyst purple
March aquamarine pale blue
April the diamond is colorless
May emerald bright green
June pearl cream
July ruby red
August chrysolite pale blue
September sapphire dark blue
October opal white
November Topaz yellow
December  turquoise sky blue

(on the materials of the site "World of precious stones")