PFSRD:Pearl Of The Sirines
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Price 15,300 gp; Aura moderate abjuration and transmutation; CL 8th; Weight —
This pearl is worth at least 1,000 gp for its beauty alone, yet if it is clasped firmly in hand or held to the breast while the possessor attempts actions related to the pearl's powers, she understands and is able to employ the item.
The pearl enables its possessor to breathe in water as if she were in clean, fresh air. Her swim speed is 60 feet, and she can cast spells and act underwater without hindrance.
Cost 8,150 gp