To get the pearl you go back to prehistoric bikini bottom,go left at the seahorse and keep
going until you find a lump of sand,get it.Go back to the seahorse,go forward then right
and right again until you find spongegars,patars and squogs houses.Keep going right until
you find a clam,feed him the sand.
Then go to Jellyfish Fields,go left and you will find a giant clam,click on him and he
will spit out a pearl.