Lots of people believe in Astrology and even more in crystals and the certain qualities they have. A little research into the two subjects revealed that there is a multitude of information on crystals and how they relate to your birth chart that goes way beyond your star sign or sun sign as some call it. The sign that you refer to as in " I am an Aquarius ".
A very good book on this subject is Crystals for Beginners: https://play.google.com/store/books/details?id=iwzkJjiXogcC&source=productsearch&utm_source=HA_Desktop_US&utm_medium=SEM&utm_campaign=PLA&pcampaignid=MKTAD0930BO1 it has a whole lot of interesting information for those wishing to expand their knowledge on the subject.
Their will be a series of each Sun Sign in the Zodiac every month that will start with the above information and conclude with information about the current Sun Sign.
Let's take a closer look at Aquarius http://www.astrology.com/aquarius-sun-sign-zodiac-signs/2-d-d-66917
Now for some information on Aquarius and crystals,the best crystal for Aquarius is the Aquamarine. This stone is perfect for this sun signs birthday ritual, it will provide a cloak of protection around your energy and also promote creativity.
Here are a few helpful links to some of the mentioned stones.
For those that want to delve deeper into this subject, you should find out the time of day you were born and learn your ascendant sign and even if you just know exact place you can learn your moon sign. You will then have a much better understanding of your personality. Your moon sign is much more telling of your emotional self. An ascendant signs change every 2 hours of every day all year long. So, you can see, it is not as simple as “ I am an Aquarius “