'Costume jewelry' diamond really worth hundreds of thousands

Consider the person who dropped about 10 pounds (about $15) around 30 years ago on what was thought to be a piece of costume jewelry -- it turned out to be a 26.27 carat white diamond.
3:00 | 05/22/17

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Transcript for 'Costume jewelry' diamond really worth hundreds of thousands
I saw a woman replies this rain didn't. Thirteen dollars she worked for two decades totally happy with it word every day completely clueless he wasn't an over the top costing vis a jewelry. A 26 carat cushion hot antique white diamond she got for thirteen dollars. Yeah now that woman who wishes to remain unknown we'll get a serious return on that flea market investment as it hit this Sotheby's auction block in July we can split it. Expected dispatch. Are up 450. Thousand. Clarity now had revealed and that is why you that's why have breakthrough salespeople. We are yesterday about new lease on April and yelled hitting. It almost did I have time I don't be very hard through the a bargain why. Yeah I think he's not putting into Michael Strahan after my teeth and a look at what my hand at.

This transcript has been automatically generated and may not be 100% accurate.

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