The Cannes film festival was hit by a second jewellry heist yesterday after a diamond necklace worth $2.6 million USD (2 million euros) disappeared during a star-studded party, according to upmarket jeweller De Grisogono.

The necklace was part of the company's 20th anniversary collection paraded by 20 models at a glitzy event earlier this week.

Sharon Stone, Leonardo DiCaprio and Paris Hilton were among the guests.

Fawaz Gruosi, the founder of the Swiss jewelry house, said the firm's staff, 80 bodyguards, local police and hotel security had been on duty but when the final check was conducted at the end of the night the long-stranded diamond necklace was missing.

Another Swiss jeweller, Chopard, had gems worth $1.4 million (USD) stolen in the first week of the 12-day festival on the glamorous French Riviera.

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