Akuyaku Reijo no Nariagari Ringoku de Hoseki no Seijo to Yobareru Made

The protagonist is Eliza, a Duke's daughter who becomes completely blind to her surroundings whenever gemstones are involved.

During her wedding to her philandering fiancé, Prince Marquis, she takes one look at the "National Treasure" tiara placed on her head, realizes it is a fake, and loudly dismisses it as "trash."

The Prince immediately annuls their engagement and sentences her to exile on the spot. But just then, the Crown Prince of a neighboring empire steps in with an offer to take her back with him...

Once hated by her people as the "Gem-Eating Villainess," this is a fantasy story about Eliza rising to glory using her overwhelming passion and vast knowledge of jewelry.