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This short tutorial explains the 4Cs of Diamonds - cut, colour, clarity, and carat weight - the most important characteristics to understand when making a diamond purchase.
The most important of the 4Cs is cut because it has the greatest influence on a diamond's sparkle.
The second most important of the 4Cs is colour, which refers to a diamond's lack of colour. The less colour, the higher the grade.
As the largest online diamond retailer, Blue Nile offers the largest collection of the world's finest cut diamonds. Pre-selected for exceptional quality, the cut, colour, and clarity of our loose diamonds are evaluated based on a standardized grading scale. Also, each loose diamond is accompanied by a grading report from either GIA, AGSL, or GemEx, independent diamond grading labs with stringent grading and certification guidelines.
If you find a comparable GIA-graded diamond at a lower price, we'll review to match the price.
We offer a lifetime diamond upgrade program on all GIA and AGSL-graded diamonds.
Blue Nile diamonds are ethically sourced with a zero-tolerance policy for conflict diamonds.
Check out our customers’ recent creations and find inspiration for one of your own.