Where did the different birthstones originate, and why are certain birthstones for certain months?
The wearing of the gemstone associated with your birth month is thought to bring good luck and good health. Astrologers long ago attributed supernatural powers to certain gemstones. The ones we associate with certain months now are not necessarily the same ones as in ancient times. The list fluctuates with the availability and cost of the stones. Once, color was the most important feature of a stone. Ancients did not distinguish between a ruby and a garnet, for example. The names used in history may not relate to the stone we think of with that name today. For example, a sapphire in the Bible was probably what we know today as lapis, and the diamonds were probably a white sapphire or white topaz. The stones originally assigned to each month related to the stones appearing on the breastplate of a Jewish high priest.