I heard a question online about birthstones and their permissibility. Most people are unware of their history and the meaning of them. Below is the information about these types of gems and I hope that InshAllah this will help shed light on the issue.
The History of Birthstones
Photos of Birthstones The idea of birthstones -- a gemstone assigned to each month of the year -- is thought to be an ancient one, and scholars trace it back to the Breastplate of Aaron described in the Bible in the book of Exodus. The Breastplate was a religious garment set with twelve gemstones that represented the twelve tribes of Israel. The gems were set in four rows of three: sardius, topaz and carbuncle; emerald, sapphire and diamond; ligure, agate and amethyst; and beryl, onyx and jasper.
So how did we get from gemstones representing the twelve tribes of Israel to birthstones? The writings of Flavius Josephus (1st century AD) and St. Jerome (fifth century AD) made the connection between the 12 stones in the Breastplate and the 12 signs of the zodiac. The idea was proposed that each of the gemstones had special powers associated with the corresponding astrological sign, and that wearing these stones at the right time would have therapeutic or talismanic benefits.
But this was not quite the same idea as our concept of the birthstone. Based on this astrological model, one ought to own a collection of the 12 different gemstones assigned to the signs of the zodiac, and wear the appropriate gem during the ascendancy of the corresponding sign. This is more like the Vedic astrological tradition of India, which assigns 9 different gemstones to 9 planets, and prescribes the wearing of particular gems according to your health and the challenges you face in your life.
Also in Roman, English, and Indian history people would carry,give, and use these stones to heal a person, to protect a wife's chastity towards her husband, and also protect a warrior from getting harm. They believed that merely touching these stones these actions would be performed.
So as you can see not only are these birthstones associated with the zodiac which is based on shirk but also people believe that these gems which are only a creation from Allah have powers that only Allah Subhānahu wa ta'ala can only have. Even though they do have biblical history it is clear that they are mainly associated with Shirk.