This is a beaded necklace, it has 3 charms based on Jesus. The fish charm represents Jesus Christ and the cross represents his crucification. This necklace is okay if it touches water but its not recomended or in water for long periods of time.
John 4:14 states, "but whoever drinks the water I give them will never thirst. Indeed, the water I give them will become in them a spring of water welling up to eternal life."