I found my Blister Pearl at a garage sale! lol :)
I went to a garage sale to find accessories for summer. I was looking through the necklace section at some cut shells and touched a bump on the back of one of the pieces of shells, but when I turned it around I noticed what looked like a defect on it (a bump)... it was unique so I took that one and paid $1 for it. When I showed my mom, she said it was a Blister Pearl but we have no idea how much it could be worth, how common it is, or what kind of shell it is. Can you please help? Thanks!