The Origin Of Birthstones

Birthstones are gems associated with the month that a person was born. To start off, here's the list of each birthstone by month.

Birthstones appear to have a biblical source, tracing back to the book of Exodus in the Bible and specifically on the breastplate of Aaron. The breastplate was inlaid with 12 gemstones that each represented the twelve tribes of Israel at the time. This specific breastplate was adorned with the following gems: emerald, sapphire, diamond, topaz, carbuncle, sardius, agate, ligure, amethyst, onyx, jasper, and beryl.

Source: https://www.forbes.com/sites/trevornace/2017/07/02/birthstones-discover-birthstone-color-month/#69eb9aa01f06