Leighton has been run at arm's length and Hochtief argues that ACS's bid is really aimed at acquiring Leighton as the jewel in its crown.

ECONOMIST: Two construction giants seek to evade a Spanish predator

The same security is in place at the Topkapi Palace, the jewel in the city's crown and its top tourist attraction.

BBC: NEWS | Europe | Tourists defy Istanbul bombers

But the biggest blow to BAA's future is the implacable opposition of the Conservative Party to its plans for expanding Heathrow, the jewel in BAA's crown.

ECONOMIST: Britain��s biggest airport operator feels hard done by

The avalanche of petrodollars may sound frightening, but the Kuwaiti Investment Office remembers well the pressure from Margaret Thatcher's government to reduce its 22% stake in BP, the oil jewel in Britain's crown.

FORBES: Magazine Article

Daimler already controls the crown jewel in Mitsubishi's empire, its Fuso commercial truck business.

FORBES: Better Off Dead

With its wide range of artists, Parlophone had been described as the "jewel in the crown" of EMI.

BBC: Warner Music to buy Parlophone label from Universal

On the other hand, I also gather that the Bancroft family, which is the single largest private shareholder in the Wall Street Journal and the Dow Jones company, is reluctant to see its crown jewel possession, the Wall Street Journal, fall into the hands of, well, the same guy who owns the Fox News Channel.

NPR: World Bank Changes, Understanding Unemployment