You've gotten good advice.
With that many unknowns, and time pressure involved you can't make a rational decision.
I might offer someone a shooter price for one that includes a right to inspection and return with full refund.
Otherwise, I'd let this Gem go to someone that can judge it's value, or that is willing to take an unreasonable risk.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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