In early times there was no separation between religion and the zodiac. They were considered one and the same. Crystals and stones were very much a part of spiritual worship in those days. The breast plate of Aaron contained a stone for each tribe of Israel. These stones were attributed to the zodiac. Included here is a graphic with the Ancient crystal for Aquarius along with modern day stones. I always say that it is best to pick what you are intuitively drawn to.