▁white ▁advent ur ers ▁first ▁rec ru ited ▁Ab original s ▁to ▁collect ▁p ear l ▁o yst ers , ▁they ▁found ▁P . ▁alb ina , ▁as ▁it ▁was ▁accessible ▁from ▁w ading ▁or ▁sw imming ▁off sh ore . ▁ ▁The ▁distribution ▁of ▁P . ▁alb ina ▁reaches ▁Northern ▁Australia , ▁from ▁Indones ia ▁through ▁the ▁Philippines ▁and ▁up ▁to ▁Mic ron esia . ▁ ▁The ▁w ides p read ▁distribution ▁is ▁equal ▁to ▁P . ▁maxim a . ▁They ▁can ▁also ▁be ▁found ▁in ▁China , ▁Korea , ▁and ▁Vietnam . ▁ ▁Com mer cially ▁ ▁Pear ls ▁are ▁only ▁occasionally ▁found . ▁They ▁are ▁yellow ▁and ▁small . ▁ ▁The ▁n acre ▁is ▁thin ▁and ▁the ▁shell s ▁are ▁small , ▁making ▁them ▁of ▁little ▁commercial ▁value . ▁However , ▁before ▁the ▁introduction ▁of ▁the ▁Mississippi ▁shell , ▁their ▁ideal ▁shape ▁for ▁buttons ▁made ▁“ Sh ark ▁Bay ” ▁shell s ▁critical ▁to ▁the ▁Mother ▁of ▁Pear l ▁Indust ry ▁in ▁the ▁ 1 9 th ▁century . ▁Today , ▁the ▁species ▁is ▁used ▁for ▁cult uring ▁bl ister ▁p ear ls ▁( M abe ▁p ear ls ). ▁ ▁References ▁ ▁S ources ▁▁▁ ▁http :// shell . kw anse i . ac . jp /~ shell / pic _ book / data 3 7 / r 0 0 3 6 6 6 . html ▁ ▁Category : P ear ls ▁Category : B ival ves ▁of ▁Australia ▁Category : Fa una ▁of ▁Western ▁Australia ▁Category : In