Pearl bolts (e)

Enchanted pearl bolts are iron bolts tipped with enchanted Pearl bolt tips made from Oyster pearls. Pearl bolts can be enchanted into enchanted pearl bolts through the spell Enchant Crossbow Bolt (Pearl) by a player with 24 Magic. The spell enchants 10 pearl bolts at a time and requires 1 Cosmic rune and 2 Water runes to be cast.

Enchanted pearl bolts are enchanted with the Sea curse enchantment. This gives the bolts a chance of striking the opponent with a mighty bolt of water, dealing extra damage. This ability is negated by opponents wielding water staves. However, it will have more damage and a higher accuracy, on firey monsters (i.e. Tzhaar).

Note: The chance of it occuring increases as you complete the Seer's Tasks.

Enchanted pearl bolts are one of the few items that players can make a profit on through buying the raw materials off the Grand Exchange and selling the finished product. To make 30 enchanted pearl bolts, you need three iron bars, 30 feathers, five oyster pearls, and three cosmic runes. (30 is the fewest that players can make without wasting materials, and a staff of water is always good to use rather than water runes)

The effects of these bolts seem to be the opposite of enchanted dragonstone bolts.