Birthstones are assigned to a person depending on the month they were born in. Each month has a different stone, for instance, April’s is a diamond. This dates back to the breastplate of Aaron which contained twelve gemstones representing the twelve tribes of Israel. The current list dates back to 1912 with only one addition since then – the tanzanite was added to December. According to many legends, birthstones (particularly when worn during it’s assigned month), have healing and therapeutic powers.
Although they have the same molecular structure and properties as a genuine stone, these are man-made stones. They have a hardness factor on the Mohs scale of 7 or 8. Using this same scale, a window glass is a 3 and a diamond is a 10.