After six months of intricate cutting and polishing, closely held Cora will showcase the Blue Moon at the Natural History Museum of Los Angeles County starting Sept. 12.

After the exhibit closes in January, the stone may sell for “tens and tens and tens of millions of dollars,” said Gomes. The company has already received unsolicited calls from potential buyers.

“This stone, I would say, is the highlight of my career,” she said.

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