Top 8 Best Round Cut Diamonds | 2021 Reviews + Guide

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Diamonds have been celebrated and cherished for their more than magical appearance and elegance. You can see them on the most signature jewelry of kings and queens and almost every other engagement ring.

But, did you know that the vast majority of these diamonds are sold as loose stones and not on ready-made pieces of jewelry. That’s because it gives you complete control and more options to select the exact shape, specifications, size, carat weight, and cost you want. This is an option that can never be true for ready-made pieces of jewelry.

You may think that this makes choosing your diamonds more difficult, but that’s where you’re mistaken. Regardless of if you know how to choose which diamond is best or not, this guide should help you get the best loose stone that fits your budget. Read on to see just what makes diamonds as great as they are.  

Top 8 Best Round Cut Diamonds Reviewed

  1. 1.03 Carat Round Diamond by James Allen – Best Overall
  2. 1.03-Carat Round Diamond by Blue Nile – Best Value
  3. ASTOR™ 1.34-Carat Round Diamond by Blue Nile – Editor’s Choice
  4. True Hearts™ 3.52 Carat Round Diamond by James Allen
  5. True Hearts™ 0.71 Carat Round Diamond by James Allen 
  6. ASTOR™ 0.82-Carat Round Cut Diamond by Blue Nile 
  7. 0.30 Carat Round Diamond by James Allen
  8. 0.71 Carat Round Diamond by James Allen

#1. 1.03 Carat Round Diamond by James Allen – Best Overall

1.03 Carat Round Diamond

Specifications:

  • Cut: Ideal
  • Color: G
  • Clarity: I1
  • Carat Weight: 1.03
  • Certification: GIA

If you are looking for gemstones online, among the best places you can get a loose diamond for your jewelry is James Allen’s website. They are an amazing retailer that offers thousands of wide ranges of diamonds at different cuts, colors, clarity, weight, and price. What more, they are the exclusive retailers of the gemstones they offer.

James Allen offers an amazing balance between quality and value. You will, without a doubt, get the best loose diamond that fits you best with them. And, you won’t have to worry about unexpected hassles or conflicts when getting a piece from their collection.

With that said, James Allen’s 1.03 Carat Round Diamond is the perfect balance with everything you need from the best loose round-cut diamond. This diamond is the best one for people who are looking for something that easily fits a budget without any sacrifices in the quality of the diamonds.

This has excellent cut, polish, and symmetry. It is near-colorless at an exceptional value. At 1.03 carats, this may have some imperfections, but as the perfect diamond that can fit everyone’s budget, it’s perfect.

This diamond is the perfect balance of everything you need to consider when getting the best loose diamond. This, with the more than desirable round-cut it has, makes this loose diamond the top on this list and the best in the market. Highly recommended that you get it.

ProsCons
Precise proportions, polish, and symmetry
The carat has a smaller face-up size
Great details and almost colorless
Blemishes can still be apparent
Can be paid for in installments
Perfect for engagement rings
Best value for money

#2. 1.03-Carat Round Diamond by Blue Nile – Best Value

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Specifications:

  • Cut: Ideal
  • Color: G
  • Clarity: SI2
  • Carat Weight: 1.03
  • Certification: GIA

Another retailer of the best loose diamonds on the market is Blue Nile. Each of their gemstones emits radiance and elegance, making them among the most attractive collection of diamonds in the market. They can compete with James Allen’s diamonds, but what edges them out is that their name is attached to luxury more than any other. 

Blue Nile’s 1.03 Carat Round Diamond boasts an ideal cute that shows off the elegant and radiant pattern you know and love in the best diamonds. This loose diamond will improve the luminance of each and every ray of light that touches it. This is a sophisticated piece that features glamour and makes it ideal for even the fanciest occasions. 

Everything about this diamond is excellent. It is more expensive than the top pick on the list, but the clarity this offers cannot be compared to any diamond in its class. It edges out the competition in everything, from the cut, color, and clarity to the polish, depth, and symmetry. This diamond is just the best.

By no means is this the perfect, eye-clean, and radiant diamond that everybody dreams about, but it is a perfect choice that balances value and quality. Some people may want to get a piece with a higher grade, but for those looking for an amazing piece for a reasonable price, this one is for you.

ProsCons
Great balance between quality and value
Inclusions can be seen in closer inspection
Great details and almost colorless
Slightly expensive
Perfect for engagement rings
Great alternative to 1st place

#3. ASTOR™ 1.34-Carat Round Diamond by Blue Nile – Editor’s Choice

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Specifications:

  • Cut: Astor by Blue Nile™ Ideal
  • Color: D
  • Clarity: IF
  • Carat Weight: 1.34
  • Certification: GIA and GEMEX

When it comes to luxury, Blue Nile’s Astor collection embodies the world itself. Each of the gemstones in this collection screams elegance and sophistication and demands attention. They all explode with beauty and shine, making them among the most attractive collections in the market. 

Each of the diamonds in the collection is of the highest level, and the 1.34-Carat Round Cut Diamond is the best. Only less than 1% of all the diamonds in the world can pass the Astor standards on proportions, polish, and symmetry, and this loose diamond tops the small percentage as well.

Astor’s ideal cut diamonds are like no other. The name alone guarantees quality and sophistication. And, this piece of loose gemstone is not meant to disappoint. It is the most highly graded piece on the list. With a grade of “D” in color, “IF” in clarity, and a perfect length to width ratio, this piece is far too good to pass on.

This diamond is a head-turner. It may not be the cheapest piece on the list, but for those willing to spend some money for absolute luxury, this is as beautiful as it is valuable. There simply isn’t any other loose diamond in its class that can compare.

ProsCons
Most highly graded on the list
Very Expensive
Perfect for engagement rings
Great details and colorless
Very luxurious
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#4. True Hearts™ 3.52 Carat Round Diamond by James Allen

3.52 Carat Round Diamond

Specifications:

  • Cut: True Hearts™ 
  • Color: E
  • Clarity: VVS1
  • Carat Weight: 3.52
  • Certification: GIA

The True Hearts™ cut by James Allen is their answer to the people’s call for luxury. Only the best 1% of all diamonds deserve to be placed in this category, and James Allen makes sure that each of them meets their very high standards.

And, when it comes to True Hearts™ diamonds, the 3.52 Carat Round Diamond by James Allen is the pinnacle of luxury and grandeur when it comes to round-cut diamonds. You can find everything you want from the best diamonds in this loose stone, but you will have to pay a hefty price for it. 

The very high quality that this large stone boasts is thanks to an array of features it holds. This diamond features barely any color and can be missed by even a trained eye. The clarity of this loose stone is amazing as well. You will find it difficult to see any inclusions even under 10x magnification. And, of course. The True Hearts™ cut on this diamond maximizes its beauty and makes it more brilliant and appear larger than other diamonds in the same carat weight. 

This loose gemstone may be expensive, but for people looking for the best and grandest centerpiece on their statement pieces, this is the best choice in the market. There are barely any pieces that can compete with this diamond in terms of beauty and quality, and if you’re willing to pay the price, this one is for you.

ProsCons
Perfect for statement jewelry piecesMost expensive piece on the list
Great carat weight and quality
Overall amazing stone
Very luxurious

#5. True Hearts™ 0.71 Carat Round Diamond by James Allen

0.71 Carat Round Diamond

Specifications:

  • Cut: True Hearts™ 
  • Color: E
  • Clarity: VVS2
  • Carat Weight: 0.71
  • Certification: GIA

Another piece from James Allen’s True Hearts™ collection, this 0.71 Carat Round Diamond is another great option. This piece’s cut ranks at the same level and quality as the most expensive choice on this list, but for a much, much lower price. But, don’t get it mistaken, the lower price of this diamond doesn’t mean that it’s not as amazing.

Aside from the amazing cut on this piece, there are several other features that this diamond can boast. The diamond’s color is graded at a high “E” because of its lack of color that even a seasoned jeweler can see. It also has a “VVS2” clarity grade as its inclusions can barely be seen even under 10x magnification. 

This diamond is a great option for those who are looking for that eye-perfect diamond but do not want to pay too much for the piece. This mid-priced loose diamond from the True Hearts™ collection is the perfect budget alternative to the market’s highest quality round-cut stones.

ProsCons
Can be paid for in installmentsHas slight traces of color
Great high-end alternative
Overall amazing stone
Very high quality
Amazingly cut

#6. ASTOR™ 0.82-Carat Round Cut Diamond by Blue Nile

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Specifications:

  • Cut: Astor by Blue Nile™ Ideal
  • Color: I
  • Clarity: VS2
  • Carat Weight: 0.82
  • Certification: GIA and GEMEX

This is another great piece from the ASTOR by Blue Nile™ collection. After all, this collection holds the top 1% of the best diamonds on the market today. And, like every other loose diamond from that collection, this 0.82-Carat Round Cut Diamond deserves a spot on this list because it exceeds everything you would expect from a diamond on this level.

This diamond is an absolute head turner. It is a perfect balance that boasts precise proportions, polish, and symmetry. And, when the light illuminates this diamond, it can illuminate everything around it with its elegant shine and shimmer. This diamond is guaranteed to make any piece of jewelry you put on royal-looking and sophisticated. 

Aside from the excellent cut and symmetry that this loose stone has, its color and clarity also deserves appreciation. This diamond gets a color grading of “I,” and its colors can be visible at times, but since it’s under a carat in weight, this issue isn’t as obvious.  Its inclusions are also not as obvious even under 10x magnification, more so if you look at it with just your eyes. 

These features are what make this loose diamond gemstone worthy of having a spot on this list. It may not be the cheapest, but it isn’t as expensive as well. It may have some flaws, but the character and uniqueness it can offer are amazing. And since it’s the only one there is, you know that you’ll be getting a piece of jewelry that only you have.

ProsCons
Can be paid for in installmentsHas slight traces of color
Great high-end alternative
Overall amazing stone
Very high quality
Amazingly cut

#7. 0.30 Carat Round Diamond by James Allen

0.30 Carat Round Diamond

Specifications:

  • Cut: Very Good
  • Color: J
  • Clarity: I1
  • Carat Weight: 0.30
  • Certification: GIA 

There will be times when getting something with some imperfections is what you want. And, at those times, James Allen has you covered with their array of budget option round-cut diamonds. These are less expensive but have noticeable flaws, which is to be expected. 

This may not be the best-looking diamond on this list, nor is it the highest quality loose stone around, but it’s still a great option for people on a budget. It’s not perfect, but there are times that the thought of getting a diamond ring is more easily appreciated than going leaps and bounds to get something you cannot afford.

Unlike the previous gemstones, this piece will not set you back by over $1000. This is because of its inclusions and lower carat weight. However, you are still sure to get the best quality jewelry with James Allen if you decide to choose this instead. And, if you ever choose to get jewelry with this diamond on it, you are sure to get an amazing piece with a gemstone that has character and, possibly, more sentimental value. 

ProsCons
Reasonable for its priceHas noticeable flaws
Very affordable
Great cut
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#8. 0.71 Carat Round Diamond by James Allen

0.71 Carat Round Diamond

Specifications:

  • Cut: Ideal
  • Color: M
  • Clarity: SI1
  • Carat Weight: 0.71
  • Certification: GIA 

If you want a slightly larger loose gemstone that is still within an affordable price range, you should consider getting this piece from James Allen. This is another great choice if you are looking for a mid-priced diamond. The 0.71-carat Round Diamond from James Allen will still be perfect for your jewelry despite its flaws.

It has a lower color grading and is slightly warm and yellow on the eyes, and has a few noticeable inclusions. However, it’s still very symmetrical and has an excellent length to width ratio. It may not be as flashy as other options on this list, nor is it the most affordable, but it is still just enough to make for an amazing diamond for your jewelry.

This piece of loose gemstone is the best evidence that luxury doesn’t necessarily come in perfect packages. You don’t need to pay for extra expensive diamonds to have an amazing piece. Sometimes, all you need is something as humble as this 0.71-carat diamond.

ProsCons
Inclusions are not obvious
Has noticeable flaws
Reasonable for its price
Very affordable
Great cut

Top Pick Section – Best Round-Cut Diamond

James Allen is among the best places you can get loose diamonds nowadays. They are an amazing retailer of the best diamonds and gemstones and are more than capable of making the jewelry of your dreams. 

With that said, James Allen’s 1.03 Carat Round Diamond is the perfect balance with everything you need from the best loose round-cut diamond. It is not the most expensive or flashy diamond on the list, but for each point of beauty it doesn’t have, it makes up for value and potential. This diamond is the best one for people looking for something that easily fits a budget without sacrificing the diamond’s quality.

This has excellent cut, polish, and symmetry. It is near-colorless at an exceptional value. At 1.03 carats, this may have some imperfections, but as the perfect diamond that can fit everyone’s budget, it’s perfect.

This diamond is the perfect balance of everything you need to consider when getting the best loose diamond. This, with the more than desirable round-cut it has, makes this loose diamond the top on this list and the best in the market. Highly recommended that you get it.


Best Places to Get Round-Cut Diamonds

James Allen

James Allen prides itself on maintaining the happiness and satisfaction of its clients. They are founded by people who are passionate about the things they are working with. They are jewelry enthusiasts interested in business and love to innovate the way people get their gemstone fixes. Nowadays, they are known as one of the best melting pots of jewelry pieces that you can get for the best prices. 

James Allen is not like other online jewelry stores. Their products are hand-picked and ethically sourced. They also feature an amazing 360° Diamond Display Technology on their website that you can utilize to preview the product they offer. And, they have over 200,000 customizable loose gemstones that you can choose from and make into your very own pieces.

Blue Nile

Another amazing place to get your gemstone and jewelry fix is Blue Nile. They are known for revolutionizing the way you can get these pieces. Since starting in 1999, they have grown into one of the most reliable sources of the best gemstones and jewelry pieces in the world. 

In the heart of Blue Nile’s values, there lies their desire to educate. They want their clients to learn more about diamonds and other jewelry pieces before selling them. They also have among the best customer service lines today, and they are more than ready and willing to attend to your concerns, may they be big or small. 


How To Pick the Diamond For You

Choosing a beautiful diamond essentially boils down to narrowing down the shape and quality you want from the 4Cs. After this, comparing the diamonds available for you will be much easier. However, Blue Nile and James Allen have made this easier for you. These online diamond vendors are proven to offer the best diamonds at the best prices. This is why they’re prominently featured on the list from earlier. 

Since their overhead costs are so low and they don’t overstock their inventories, you are sure to get the best deal from them. They also provide a 360° view of the diamonds you will choose from. 

Now, click on one of these to start choosing your diamond. You can choose to get it from either James Allen or Blue Nile. And without further ado, here are the steps on how to pick out the best diamond for you.

Choose the shape you want.

The shape of your diamond is the first thing you need to decide. There is no definite best shape out there. After all, this is up to your or your partner’s preferences. Round cuts are the most popular diamond shape, especially for engagement rings, because they give off the most brilliance. After selecting the shape you want, this should narrow down your search.

Choose the carat weight you want.

Are you looking for a one or 2-carat diamond ring? Are you looking for something that screams elegance and demands attention or just something simple? This is the step where you choose how big you want your diamond to be. Usually, mid-high priced rings have 0.95 to 1.08 carats. Just remember that as the carat weight increases, the size and price goes up as well.

Choose the carat weight you want.

This is the choice you will make that will most affect the beauty of the diamond you will get. Cut grades are not regulated or standardized for jewelry vendors, but getting an Excellent or Ideal Cut diamond is generally the best choice. For example, if you choose diamonds at Blue Nile, you should filter your choices for Ideal and Astor Ideal diamonds. On the other hand, choose Ideal and True Heart cuts if you’re browsing at James Allen.

Choose a color ground you want.

The goal in choosing the color of your diamond is getting something that appears white. In this regard, you do not necessarily need to pay for a “D” or “E” diamond to get a colorless gemstone. Even “G” to “I” range diamonds can appear white without being too costly.

It would be best if you remembered that different shapes and cuts would affect the stones’ ability to reflect light. This is why it is a good idea to choose a diamond with optimal color and a balanced appearance that optimizes for beauty instead of carat weight.

Choose the clarity grade you want.

When it comes to a diamond’s clarity, you want them to be as eye-clean as possible. These diamonds are clean, and you won’t be able to see any blemishes or inclusions without magnifications. Depending on the shape, you should be able to find an eye-clean diamond in the VS1-VS2 range. Usually, you do not need to pay for FL or IF grade if you can get the same diamond in a lower grade for less.

With the recommended vendors, you can see these diamonds up close to review their clarity. For James Allen, they have the “Virtual Loupe” that lest you evaluate a loose diamond to get to see it better. On the other hand, Blue Nile is offering high-quality photographs. 

Choose one from similar diamonds.

Once you have narrowed down what you want to get, the websites should show you your preferred specs of diamonds, and you will be able to compare them much closer now. You’ll want to compare the different aspects that make a diamond great, especially the brilliance, clarity, and price.

Verify the diamond’s certificate.

It is a great idea to consider buying only GIA Certified Diamonds or AGS Certified Diamonds when you are looking for these gemstones. These two grading entities have been very reliable and consistent in recent years, unlike the other certifications. IGI, EGL, and HRD Certified Diamonds had been observed by experts as not reliable and somewhat inconsistent. 

Get an expert’s opinion.

If you have access to an expert on diamonds, it is also best that you ask them to review your choice. They should give you a better idea about the quality and true value of the diamond that you will be purchasing. Getting an expert’s opinion ensures will ensure that you get the best diamond among the choices that these online vendors will present. Also, you should be more confident about your choice when you’re finalizing your purchase. 

Finalize the purchase.

After doing all these steps, you should be more than confident enough in your choice. And, finalizing the purchase should be the last thing you need to do.

But, you shouldn’t have to worry because most of these vendors offer a hassle-free return within 30 days. So if you are unsatisfied with your choice, you can easily get your money back.


Conclusion

Diamonds have been celebrated and cherished for their more than magical appearance and elegance. Nowadays, it is more usual for you to get these gemstones before they are made into jewelry. But, this does not necessarily mean that choosing what to get becomes more difficult.

That’s because it gives you complete control and more options to select the exact shape, specifications, size, carat weight, and cost you want. This is an option that can never be true for ready-made pieces of jewelry.

And among the choices in the market, James Allen’s 1.03 Carat Round Diamond is the perfect balance with everything you need from the best loose round-cut diamond. It is not the most expensive or flashy diamond on the list, but for each point of beauty it doesn’t have, it makes up for value and potential.

And, if you ever find any of these loose diamonds lacking, then you can choose to get something that fits your tastes better. Both James Allen and Blue Nile offer a wide array of choices for people looking for something more specific.

Hopefully, after reading this list, it helped you make your choice and that you will get an amazing diamond gemstone that will make any piece of jewelry you will put it on that much better.


FAQs (Frequently Asked Questions)

What is a diamond?

Diamonds are native crystalline carbon formations famous for being the hardest known mineral, scoring the highest on the Mohs hardness scale. They are usually nearly colorless, and when they are transparent and free of inclusions, they are highly valued as precious stones. They are a staple of most pieces of jewelry and are known for their beauty and elegance. They are also used in the industrial sector as cutting tools or abrasives.

What does a diamond mean?

Diamonds have been associated with health, long life, and heart health. Some believe that they are the gemstone that bestows a person with clarity and rationality for the wearer. Others believe that they promise a lasting and enduring romance when they are given as gifts for your significant other. At the same time, others think that they are gemstones associated with inner peace and insist that they represent harmony and beauty, both in appearance and personality.

Can you customize your jewelry with Blue Nile and James Allen?

Yes. Both of these websites allow you to customize the jewelry that will come with your choice of diamond. They both offer an option to customize the setting, make, and materials that come with your gemstone before finalizing your purchase. Since both of them are committed to giving you the jewelry of your dreams, they provide you with more options that will allow you to balance your wants and your resources. They also both offer customer support that can help you make the best choices for yourself.

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