it is not bleached, it is the size of a quarter and is pearl color with a sort of irredecent tint to it. he said he would not sale it until he finds out what it is worth.
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The fact your LFS owner wants to "find out how much it's worth" sounds like he's pretty much a prick as it is. Sell it for the approriate markup of what he paid for it, it's Iowa FFS why is he acting like he's got a gem there to make money.
Eitherway I'm having a hard idea for picturing what "pearl" colored, pearl to me is an off white, which is a bit bleached.. I have some light tan/pearl ones I don't think they are particularly rare.