Black Pearl

is a magic spell Reagent and a resource used in the Alchemy skill. It can be harvested from Oyster Beds using the Foraging skill, found as loot from defeated creatures, purchased from NPC merchant vendors or purchased from player vendors.

Gathering
Black Pearls can be found by harvesting oyster beds along some bodies of water and swamps. The color of the unharvested oyster resource node is often very close to the color of the nearby ground, making them very hard to see. Raising the Survey - Foraging skill, will make foraging resource nodes have a glow around them making them a little bit easier to see them.

Currently, harvesting black pearls during the day will only result in a small few units per harvest, but harvesting in nighttime hours (Evening through Late Night or about :52 to :07 during Earth hours) will result in multiple units per harvest. The harvest will also result in multiple units of oyster meat.

Trivia

 * Black pearls are a traditional reagent in Ultima.
 * Original description:  They are found in oysters, but ONLY on new moon nights, otherwise the oysters yield some oyster meat and periodic white pearls.