Geneva, Switzerland CNN  —  Even by the standards of watch boxes — typically oversized for the objects they hold — Chopard’s latest leather case, unveiled at watch fair Watches and Wonders, is strikingly large. But the grandeur is justified. Open it, and it reveals not one, but twelve L’Heure du Diamant watches, arranged like precious petals. Each piece features the same diamond-studded bezel, framing twelve different dials crafted from thin, round slices of hard-stones including apple-green