Long the redheaded stepchild of the diamond world, earth-tone diamonds in varying shades are now emerging as a favorite son. Just don't call them "brown." Marketed as "cognac," "champagne" or "chocolate," brown diamonds are in demand by today's fashion-conscious consumers who want jewelry that can be matched to their outfits.

Brown and yellow are the two most commonly found colors in the diamond world. "Common" is a relative term, however, as only one out of every 10,000 diamonds officially qualifies as a colored diamond, says Robert Mays, executive director of the Natural Color Diamond Association (NCDIA).

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