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The diameter of a one-carat round or brilliant cut diamond typically measures between 6.4 and 6.5 millimeters. The term carat refers to weight not size, so a one-carat diamond doesn't need to conform to specific measurem... More »

The price range for 1-carat diamonds is between $3,080 and $26,950 per carat. The price of a 1-carat diamond depends on many factors and can therefore vary greatly. More »

Individual diamond prices vary and depend on the characteristics of each stone. Established in the 1940s, the grading system currently in use weighs each stone's color, clarity, cut and carat weight in determining its pr... More »

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A round diamond typically has 57 to 58 facets. This is one of the most famous diamond cuts, and it makes up 75 percent of all diamond sales. Compared to a round diamond, a princess diamond has 53 facets and an emerald ha... More »

Good diamond testers identify diamonds based on their electric conductivity instead of heat conductivity. Testers that identify both properties are even more accurate. In addition, a good diamond detector should notify t... More »

Scratching another stone with a suspect diamond is an excellent test of authenticity. Scratching determines the hardness of the stone, which is a key identifying characteristic for diamonds. More »

Diamond cleavage is a straight-lined crack in a cut diamond. Diamond cleavage is one of many inclusions, or flaws, that reduce the value of a diamond. Diamond cleavage reduces the value of diamonds not only because it is... More »