Jones, a farmer, found an odd-looking stone in his fields. He went to Smith, the town jeweler, and asked him what he thought it was. Smith said he did not know but thought it might be a ruby. Jones asked Smith what he would pay for it, and Smith said $200, whereupon Jones sold it to Smith for $200. The stone turned out to be an uncut diamond worth $3,000. Jones brought an action against Smith to recover the stone. On trial, it was proved that Smith actually did not know the stone was a diamond when he bought it, but he thought it might be a ruby.

Can Jones void the sale? Explain.