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Diamond Bayou lab Diamonds
The Signature Difference
Signature Jewelry Collection
BUILD YOUR OWN DIAMOND JEWELRY ®
DESIGN YOUR OWN ENGAGEMENT RING
GET INSPIRED BY CUSTOMER'S RINGS
ENGAGEMENT RING STYLES
THE STAR COLLECTION
Diamond Bayou Collection TM
SHOP BY STYLE
SHOP BY SHAPE
PRECIOUS METAL EDUCATION
This short tutorial explains the 4Cs of Diamonds - cut, color, 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.
Learn More About Cut
The second most important of the 4Cs is color, which refers to a diamond's lack of color. The less color, the higher the grade.
Learn More About Color
Often the least important of the 4Cs because the tiny imperfections are often microscopic.
Learn More About Clarity
The term carat actually refers to the diamond's total weight and not its size.
Learn More About Carat
Each diamond shape has different attributes that affect price and quality grade.
Learn More About Shape
Unbiased diamond grading reports are offered with every Blue Nile diamond.
Learn More About Certification
As the largest online diamond retailer, Diamond BAYOU offers the largest collection of the world's finest cut diamonds. Pre-selected for exceptional quality, the cut, color, 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.
Diamond BAYOU diamonds are ethically sourced with a zero-tolerance policy for conflict diamonds.