"You can't comp this out," the appraiser explained of the ring's rarity. Every engagement ring is special, but there's something extra remarkable about heirloom diamonds, which come with their own ...

An Antiques Roadshow guest didn't think their particular family heirloom was worth much, but it turned out to be one of the show's biggest appraisals.

(NEXSTAR) – There’s so much to love about “Antiques Roadshow,” from the antiques to the experts to the little history lessons embedded in each appraisal. And every once in a while, an item turns out ...