Bag of Pearls

This purple velvet pouch contains within 6 white pearls, and one black one. If one of these pearls were to be taken out of the bag and within 1 minute, submerged in some amount of water, a seagoing vessel will burst out from the pearl for 24 hours. The white pearls will produce rowboats with this effect, where as the black pearl will produce a a full sailing ship with black sails. After the 24 hour duration is up, the boats will violently fold up into a small calcified stone, approximately the size of the original pearl it spawned from. 

Notes: 6 white pearls, 1 black pearl