Dull Pearl pearl_dull

What it is for

Loot: exists to be sold or used in a recipe.

Sells to an NPC for about 410 gold. Weighs 2 of your carry capacity — and weight is what stops drops once the bag fills up.

The best source is Grotto Squid, at 66% per kill. Another 3 monsters also drop it. You can farm it at Sea Grotto.