Why are your birthstones lucky?

I was born in May so my birthstone is emerald. What i8s the meaning of emerald?

Emeralds are, by weight, the most valuable gemstones in the world. Emeralds are a form of the mineral beryl that is colored green by small amounts of vanadium and chromium, and sometimes iron. Since beryl is not found in the same part of the earth's crust as the other elements, we're very lucky that emeralds have ever even formed at all! In fact, emeralds symbolize luck and wealth.

Emerald is a precious gem that promotes creativity and perception. It also acts as a natural tranquilizer when you are worried or your mind is troubled. Emeralds symbolize serenity, success in love, wealth, happiness and peace of mind. Improves the memory, helps insomnia, strengthens the immune system, helps with eye sight, restores youth, aids neurological diseases, heals ear problems, eases child birth.
Emeralds have been treasured for thousands of years. The infatuation with Emeralds dates back to ancient Egypt and Rome. It is said that Cleopatra was always adorned in Emeralds and that this was her most treasured jewelry. The earliest emeralds date from the Ptolemaic era (320-30 B.C.), but there have been discoveries of mining tools going back to Ramses II (1300 B.C.) or even before. In the Middle Ages, deposits were also uncovered near Salzburg, Austria. By the 16th Century, however, Colombia became the most celebrated diamond producer, with the stones being traded throughout South America. To the Romans, emerald was dedicated to Venus, the Goddess of Beauty, and symbolized the reproductive forces of nature. To the early Christians, it represented resurrection.

its not your birthstone thats only lucky, its any stone that you like and that feels right, you don't only have to go by the stone that falls under that month.