We don't normally do appraisals at P-G, insomuch as help you identify your pearls and steer you in the right direction to reputable collectors.
That said, we'll need a lot more information. If you have any recollection or history as to the origin and species of the pearl, please comment.
If you know the crafter or shop that did the work, it's a big help.
Likewise, more photos from different angles (side, back), using macro settings against a plain white background.
Does the pearl pass light when held up to light source?