I am writing you to give you a little more information about your pearl. I also have a rare quahog pearl it is a bit larger than the one you have. I brought the pearl to New York City to the GIA who gave it its certification of authenticity. I also brought it to a renowned pearl expert who wowed at it like she had when she viewed the Golash brooch. Some have said estimated auction value is in the $500,000 range. More information to follow...