Meanwhile her tiara, just right for attending the coronation of a monarch, could be dismounted from its frame and reversed into a necklace suitable for the opening of the opera season.
Her tiara can be changed into a necklace.
mnli hypothesis: Her tiara can be changed into a necklace. premise: Meanwhile her tiara, just right for attending the coronation of a monarch, could be dismounted from its frame and reversed into a necklace suitable for the opening of the opera season.