Found a dark purple pearl

by Yolande
(Massachusetts)

Hello,
My husband has been clamming in Duxbury, MA for many years now. We eat shellfish all year long. He even clams in the winter. We were eating steamed quahogs last week and my husband found it. It is dark purple and is 6mm long with almost 5mm wide. I am wondering if it is worth anything or where I should go with it. Any information would be much appreciated. I should tell you all that I make jewelry as a hobby and years ago named my hobby The Purple Pearl. I learned how to do this from my Mother who has passed and liked the name since she loved the ocean so.
Thank you for listening. Yolande- The Purple Pearl