There's a famous story, mentioned here and in many other places – the legend of Reb Yitzhak's diamond. What's the source of this story?
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Unlike the story you linked, he says that the priest wanted to buy it from him to use for the eye of an idol (I assume that's what עין פלו[ני] means), not for a cross. This version also doesn't have the heavenly voice compare his wisdom to King Solomon.