It's that Pisces time from February 20th through March 20th. What does this mean? Well the sun is in Pisces although the moon moves around from sign to sign all month. Anyone born during this time period is considered to be a Pisces which is a water elemental sign. Water elemental stones strengthen the positive sides of a Pisces and Fire elemental crystals will balance out the negative traits.
Zodiac stones came into play during early times. The Breast Plate of Aaron contained 12 stones within it. These were later attributed to the 12 months of the year. They gave us our early birthstones. Amethyst is a Water elemental stone and it's balancing/grounding effects are perfect for a Pisces.
Each sign has a Ruling Stone, a Sun Stone, and a Moon Stone. The various Ruling stones for Pisces are listed in the graphic. The Sun Stone for Pisces is Tiger Iron, and the Moon Stone, is White Aragonite.