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The Gemological Institute of America ( GIA ) grades many diamonds of one carat or greater according to the four Cs: cut, color, clarity, and carat weight. The interplay of the four Cs determines a diamond's value.

Proper cut enhances a diamond's capacity to reflect light and makes it sparkle more; a diamond's depth, distance from top to bottom, should be about 58-61 percent of its width, which means the gem should be wider than it is tall.

Most diamonds contain slight traces of yellow or brown, and the more colorless a diamond, the greater its value; most of the diamonds that retailers sell are in the near-colorless color grades, or G through J.

Clarity refers to the number of spots, or inclusions, in a diamond, and the fewer the inclusions, the clearer the diamond and the brighter its sparkle; retailers mostly sell diamonds in the very slightly included clarity grades and in the slightly included clarity grades.

A diamond's value rises as its size, or carat weight, increases; a carat is one-fifth of a gram, or about 7 / 1,000 of an ounce.

Diamond Clarity Chart
F	IF	VVS	VS	SI	I
Flawless	Internally Flawless	Very Very Slightly Included	Very Slightly Included	Slightly Included	Imperfect

Women's Wire Magazine says in one of their articles about:
Hunting and Haggling for That Gem of a Deal

No matter where consumers shop, though, they can't avoid one fact of diamond economics: as a diamond's carat weight increases, keeping the three other Cs the same, its price rises exponentially. At Landsberg's store, a two-carat diamond with the same cut, color, and clarity as a one-carat stone costs about $13,000-almost three times as much. That's because big stones are in shorter supply than small ones, jewelers say.

The shopper who ventures away from the big retailers would be wise to get a referral before putting down a large sum of money. "Go to someone whom somebody else has purchased from," advises Norman Landsberg, who for 50 years has run a family jewelry business in New York's diamond district. Landsberg says most of his business comes from referrals. His store, no more than a counter about the size of a kitchen table, is in a crowded shopping area on West 47th Street between Fifth Avenue and Avenue of the Americas, one of the world's busiest diamond markets.

Competitors abound. Still, Landsberg's often so busy that customers have to jostle to get near the counter. And it's easy to see why. "We don't have the overhead and expenses [of bigger stores]," he says.

Learn more about GIA Diamond Grading Reports from GIA (Gemological Institute of America)

Norman Landsberg Jewelers is a proud member of:
Jewelers Vigilance Committee