For the Pices in your life, perhaps? Fish imagery is often used as a key symbolic figure - representing life, motion, and spiritual growth.  In Mexico, fish are known to represent a youthful energy, as well as creativity and independence.
 
Designer: Taxco
Brand: Novico Mexico
.925 Sterling Mark
Dimensions: 1.5"l x 5/8"w with 20" Length Silver Chain
Period: 1950-1959