Diamond Buying Guide

Written by Derick Beem


Posted on July 09 2019


Set a budget that works for you.

Forget that old-school tip about spending three months of your salary. We have beautiful engagement ring options for every budget and style.
  • Our diamond experts don't work on commission.
  • The Blue Nile philosophy is to help you to make the most of your budget.
  • We lovingly handcraft every ring that we make—regardless of the price tag.



Master the 4Cs: cut, clarity, colour and carat.

Understanding the 4Cs is key to getting the most sparkle for your budget. And if you feel overwhelmed, you can always chat, call or email our diamond and jewellery experts. They're pros at separating fact from fiction and walking you through every consideration.



Think with your eyes.

Decide where to spend your money, and where to save, by prioritizing what you see first.
  • A well-cut diamond reflects maximum light—sparkle you can see across a room.
  • To appreciate colour you need to get closer, roughly three to six feet away.
  • The highest clarity grades are only noticeable from a distance of six to eight inches.
Diamond Buying Guide Tip 3: Think with your eyes.

Prioritize cut.

Cut is the most important of the 4Cs: The better the cut, the more your diamond will sparkle.
  • We offer four cut grades: GoodVery GoodIdeal and Astor Ideal.
  • 67% of our customers choose an ideal cut for maximum sparkle.
  • A poor cut (too shallow or too deep) can make a flawless diamond appear dull.



Put clarity in perspective.

Most diamonds have tiny flaws that can only be seen with 10x magnification. For instance, SI grades aren't flawless, but still look great to the naked eye.
  • Diamonds can have internal flaws and/or external flaws.
  • The clarity grading scale runs from SI2-SI1 (slightly included) to FL (flawless).
  • A good place to start your search and maximise your budget is with SI2 and SI1 grades.
  • Weight affects clarity — if your diamond is under two carats, go with VS2.
Diamond Buying Guide Tip 5: Put clarity in perspective.
Diamond Buying Guide Tip 6: Consider near-colourless diamonds instead of absolutely colourless.

Consider near-colourless diamonds instead of absolutely colourless.

It's the absence of colour that's actually the most rare and therefore the most expensive.
  • Diamonds at Blue Nile are graded from J (slightly detectable colour) to D (colourless).
  • For a great value, start your search with a G or H grade (near-colourless).
  • Different precious metals will affect the way your diamond's colour is perceived. Choose settings with this in mind.



Weigh the pros and cons of larger carat weights.

While you may be envisioning a specific carat weight, bigger is not always the way to go. Is it important that the stone you buy is a precise carat weight—or would you be happy with a diamond that "reads" like that weight?
  • Carat is about weight, not size.
  • Prices increase exponentially as carat weight goes up.
  • A good place to start your search is with VS2 (very slightly included).
  • Carat weight is relative to finger size, setting size and diamond shape. Sometimes, smaller carat weights are the right choice.
Diamond Buying Guide Tip 7: Weigh the pros and cons of larger carat weights.
Diamond Buying Guide Tip 8: Check out fancy-shaped diamonds.

Check out fancy-shaped diamonds.

Round brilliant diamonds are our most popular, but don't rule out other shapes. All non-round diamonds are called "fancies." Fancies can look larger and cost less than a round of similar carat weight.
  • There are 9 fancy shapes: princess, emerald, asscher, cushion, marquise, radiant, oval, pear and heart.
  • Why are rounds more expensive? It's complicated, but in essence it comes down to the established cutting standards. Round diamonds are the only shape with GIA-designated cut parameters. There are exacting standards for fancies, too, but these were determined by our own master craftspeople rather than the GIA.



Buy shy to save big.

Diamond prices jump significantly at the carat and half-carat marks. Purchasing just shy of those weights is a great way to stretch your dollars.
  • The visual difference between a .9 and 1.0 carat is slight.
  • Blue Nile offers a wide selection of diamonds at non-traditional breakpoints—far more than you'd be able to find at a small, independent jeweller.
Diamond Buying Guide Tip 9: Buy shy to save big.
Diamond Buying Guide Tip 10: Look at the paperwork.
TIP 10

Look at the paperwork.

This is a major purchase, so of course you want to know that what you're buying is authentic, natural and conflict-free. We've always sold high-quality, conflict-free diamonds and we wouldn't have it any other way.
  • The finest quality natural diamonds are always independently certified.
  • Make sure your diamond comes with a grading report from the GIA (Gemological Institute of America).


TIP 11

Keep your stress level low with the right guarantees.

Gearing up for a proposal is a big deal, and you want the ring to be just right. The last thing you need to sweat over is the fine print. No worries—we've got you covered.
  • Ask about our price-match guarantee.
  • We pride ourselves on our low prices and high value, but if you find a comparable GIA-graded diamond at a lower price than ours, we'll match it.
  • Can you return it? Blue Nile offers a 30-day return policy. no questions asked.
  • Plus, Free shipping, of course.
Diamond Buying Guide Tip 11: Keep your stress level low with the right guarantees.
Diamond Buying Guide Tip 12: Trust your instincts. Don't buy anything under pressure. Ever.
TIP 12

Trust your instincts. Don't buy anything under pressure. Ever.

You should feel downright excited about your choice of diamond. No regrets. When you propose with a ring that you know she's going to love your confidence will shine.



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