Who Would Make the Ideal Pisces Soulmate for You? Historical records and astrological beliefs say that individuals under the Pisces zodiac sign are associated with not only one but amazingly two birthstones. The traditional or primary Pisces birthstone, the captivating Aquamarine gemstone and the alternative Pisces birthstone, the astonishing Amethyst gemstone. Happily, Aquamarine and Amethyst as gorgeous and healing Pisces birthstones make marriage life exciting and also help in finding a compatible & perfect Pisces soulmate with their spirituality.