Why is this giant emerald worth so much if the stones are not gemstone quality?

Re the Bahia Emerald.

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Why are the contending parties saying it’s worth 'hundreds of millions of dollars" if the stones are not gem quality. If that’s the case it seems it would be just more of a mineralogical curiosity.

Bahia Emerald legal battle tears 2 friends apart


It may not be gem quality, but 36 kg is friggin’ huge. Sometimes size really does matter.