They, together with the World Diamond Council, are asking international diamond traders not to touch Marange diamonds.

ECONOMIST: Zimbabwe and its diamonds

For once, American tourists have something in common with international currency traders: This summer, they are all wondering how the Greek financial crisis will impact the dollar.

FORBES: What the Greek Crisis Means for American Travelers

During the past 10 days, traders on the International Securities Exchange (ISE), Chicago Board Options Exchange (CBOE), and NASDAQ OMX PHLX (PHLX) have bought to open 2.65 calls for every put on the coal concern.

FORBES: Option Plays To Profit From Coal's Burnout

Digging deeper into data reveals that traders on the International Securities Exchange (ISE), Chicago Board Options Exchange (CBOE), and NASDAQ OMX PHLX (PHLX) have bought to open 2, 537 puts versus 1, 515 calls during the past two weeks.

FORBES: Options Plays To Tap Into Zillow's Strength

Foreign-currency traders are easily scared by international political developments.

ECONOMIST: Fasten your seatbelts | The

In the options pits, traders have bought to open almost five BIIB calls for every put on the International Securities Exchange (ISE), Chicago Board Options Exchange (CBOE), and NASDAQ OMX PHLX (PHLX) during the past two weeks.

FORBES: Biogen Idec Has Fallen And Can't Get Up, How To Play It With Options

Elsewhere, options traders have upped the bullish ante lately, as evidenced by recent stats from the International Securities Exchange (ISE), Chicago Board Options Exchange (CBOE), and NASDAQ OMX PHLX (PHLX).

FORBES: Euphoria Over Akamai Suggests It's Time To Buy Puts

Traders blamed the retreat of share prices on worries about possible interest rate hikes and heightened international uncertainties like the tensions between India and Pakistan.

BBC: News | The Economy | Bear market mood spreads