Signature Diamonds
The top 1% of all diamonds in the world, hand selected and cut to our most exacting standards. Custom jewellery set with diamonds from the Blue Nile Signature Collection will ship the next day if your order is placed by 4pm ET.
Blue Nile Signature Round
Our Signature round diamonds are cut with perfect proportions for maximum brilliance. Learn more
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Blue Nile Signature Princess
The only ideal cut standard applied to the princess-cut diamond. Learn more
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Blue Nile Signature Asscher
The world's only Asscher diamond cut to our ideal standards. Learn more
moreEducation and Guidance
Every diamond in the Blue Nile Signature Collection is hand-selected and cut to the most exacting standards, guaranteeing a more brilliant diamond than any other Ideal cut.
Custom made exclusively for Blue Nile, the Blue Nile Signature Collection includes the world's most brilliant round diamond.
Blue Nile Laser Inscriptions
Because diamonds of this quality are so rare, each one has a laser inscription. Only legible at 50x magnification.
Blue Nile Signature Diamond Jewellery
For a truly extraordinary gift, choose jewellery created exclusively with Blue Nile Signature Collection diamonds.
Recently Purchased Diamonds
Find out what other customers select after learning more about the four Cs.
