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Craft Your Unique Story:
From Rough Diamond to Personal Masterpiece

Choosing an engagement ring should be fun, meaningful, and personal. And it’s even more so when you experience Mine to Shine, choosing your own ethically mined rough diamond and following its journey to the ring of your dreams.

We’re here to help. Simply answer a few quick questions so we can guide you.
Let’s start with shape
All Kwiat Tiara Diamonds™ are cut to perfect standards to look bigger and brighter than others of the same carat weight.

Choose your favorite(s) below.
Now, let’s talk size
Kwiat Tiara Diamonds are perfectly cut to look bigger and more brilliant, no matter the carat weight.
Major brilliance at every price
No matter how much you plan to spend, we promise to give you the very best cut diamond with ultimate sparkle and size appearance.
Timing matters
When would you like to propose or receive the ring? This will help us select the best options for your timeline.
The search is on!
Tell us where are you in the process so we can make your experience as efficient as possible.
How did you hear about Kwiat?
Let’s get serious
If you’d like personal assistance, our concierge, Megan, can get in touch. If you’d prefer to learn more about how to choose the most beautiful diamond, we’ll share our exclusive four-part email guide.
Continue your Mine to Shine journey with us
Our Kwiat concierge will be in touch to discuss Mine to Shine in detail, ensuring it aligns perfectly with your preferences.
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Be part of something truly unique. Share your email, and we'll send you details about Mine to Shine – a program where your ring will be as one-of-a-kind as your love story.
Diamond Size

Diamond Carat

Carat is often the first thing to come to mind when thinking about a diamond’s size. Size and carat weight are closely related but there are other factors in a diamond’s appearance. Cut and shape also play a role in whether the diamond appears visually larger or smaller than its actual carat weight.

Kwiat Standards

A properly cut diamond will not have too much weight in hidden areas. The added weight increases the cost without giving the diamond a larger appearance. At Kwiat, we cut our diamonds to keep the carat weight in the right places. Each gem has the widest possible diameter to appear larger than other diamonds of comparable carat weight. And because of their superior cut, our diamonds will appear whiter than their GIA color grade. We call this the Kwiat Tiara® Cut.

Kwiat diamonds

  • 5.1 - 5.3mm
    1/2 CARAT
    4.8 - 5.0mm
  • 5.8 - 6.0mm
    3/4 CARAT
    5.6 - 5.8mm
  • 6.4 - 6.6mm
    1 CARAT
    6.2 - 6.4mm
  • 7.4 - 7.6mm
    1 1/2 CARAT
    7.1 - 7.3mm
  • 8.1 - 8.3mm
    2 CARAT
    7.9 - 8.1mm

Other diamonds

Diamond Color and Clarity

Diamond Color

Diamonds are rated on a color scale developed by the GIA, the world’s premier diamond grading nonprofit. The color grading system is based on the alphabet, beginning with the letter D and running all the way through Z. A grade of D is the best possible grade a diamond can receive, which translates to an absence of color. Diamonds with this grade tend to be the most rare and valuable.

Diamond Clarity

Clarity refers to the presence of imperfections, known as inclusions, in the crystal structure of the diamond. Nearly all diamonds contain some sort of inclusion, as they are part of a diamond’s characteristics and structure. An inclusion within a diamond is natural, and on the higher end of the clarity scale, does not take away from its beauty.


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The Kwiat Cushion™


A more beautiful shape, a more brilliant cut



The cushion cut—a romantic, pillow-shaped stone—was first developed in the eighteenth century. Throughout the years, the cushion has been evolved and refined with more facets to create “modified cushion-cut brilliants.” Most of them don’t meet our strict criteria for quality and beauty. So we decided to create our own.

KWIAT CUSHION Engagement Rings


With an elegant, elongated silhouette, perfect outline, beveled edges, and rounded corners, the Kwiat Cushion is a true brilliant cut with more sparkle and fire — and without the “crushed ice” look of a modified cut. And, unlike most cushions, it looks bigger than a round brilliant diamond of the same weight.


Inferior Shape

Boxy shape with sharp corners, undesirable length to width ratio.

Inferior Size

A typical cushion appears smaller than a Kwiat Cushion of the same weight.

Inferior Cut

Modified with extra faceting to “fake” brilliance and retain weight.


Our CEO, Greg Kwiat, explains what makes the Kwiat Cushion more beautiful than other cushion cuts.

View Transcript

My name is Greg Kwiat, and I want to help you learn everything you need to know to buy a diamond.

Today, I will introduce you to the Kwiat Cushion, simply the most beautiful and perfectly cut cushion shape diamond in the world.

We will explore what makes the Kwiat Cushion exceptional and compare it to other lesser quality cut cushion diamonds in the market.

Let’s begin with some general information about cushions.

Cushion cut diamonds are one of the most popular and appealing shapes.

The shape is as almost as old as polished diamonds themselves – diamonds cut before the late 1800s were almost always cushion in outline.

In general, cushion cut diamonds are soft rectangular or square-ish shapes with rounded corners and gently curving edges.

In the diamond industry, there’s no universally accepted set of standards that defines the cushion cut.

The world of cushion diamonds is like the wild west – anything goes.

More than any other shape, cushion cuts will vary dramatically from one diamond to the next.

Cushion cut diamonds can range from attractive elongated shapes to very square.

And the faceting style of cushions can range from a classic brilliance to the antique style to ultra-modern.

Now the problem with having so much variation in what can technically be called a cushion is that many diamond cutters use this lack of defined standards to cut sub-par – and sometimes downright ugly – cushion cut diamonds.

Cutting a gorgeous cushion shape takes skill and experience, and at Kwiat, we have been cutting cushion diamonds for more than a century.

And now after years of study and refinement, I present to you, the Kwiat Cushion.

The Kwiat Cushion is an elongated cushion shape, with beautifully rounded sides and corners.

This is the perfect cushion shape –soft, distinctive, graceful.

It has an extraordinary, classic brilliance – faceted with the traditional brilliant cut pattern without the modifications that are often found on lesser quality diamonds.

Demonstrating the great precision of the cut, Kwiat Cushions achieve Excellent polish and Excellent symmetry, which is rare in fancy shape diamonds.

Kwiat Cushions are highly consistent from one to the next, each diamond is cut with the same care and attention to detail.

And because of the way that we cut our cushions, they will have a larger surface area and bigger size appearance than all other cushion cuts.

To truly understand why the Kwiat Cushion is so exceptional, it helps to compare it to lesser quality cushions that other jewelers cut and sell.

There are basically two general problem areas when it comes to cushion cut diamonds that are subpar.

The first issue is that the general shape of many cushions is simply unattractive.

The second issue is that the faceting pattern is often poorly done leading to an ugly or lacking brilliance.

And in many cushion diamonds, we see both of these issues at the same time.

So let’s start with the general shape. To be a beautiful cushion, the diamond should have an elegant and graceful outline.

It should have a softness that comes from gently rounded sides and corners and some elongation to show its proper size appearance.

The Kwiat Cushion is exactly that – a gorgeous, elongated diamond with beautifully rounded sides.

One common variation of a badly cut cushion is the very square shape diamond with rounded corners.

And in another bad variation, we see diamonds with rectangular shapes, and nearly straight edges and very broad corners.

In these cases, the round corners of the diamond will technically earn the cushion designation from the GIA, but these diamonds couldn’t be farther from the classic cushion shape.

They lack all of the grace of the beautifully shaped Kwiat Cushion.

The square cushions look small for their size because they carry more weight on the underside of the stone.

Diamond cutters cut the square cushion shape to save weight – increasing the carat weight of the finished diamond in a way that does not appear larger.

These diamonds may “sound bigger” when you hear the carat weight, but they won’t “look bigger” when you see the diamond itself.

And those boxy rectangular shapes – they may be elongated but they really look more like radiant cuts with rounded corners that true cushion shapes.

By comparison to these imposters, the Kwiat Cushion is the perfectly cut diamond – a stunningly beautiful and soft elongated shape with a visually larger size appearance for its carat weight.

Possibly the biggest issue with most cushion shapes is that they are poorly faceted and lack beautiful brilliance.

The facets of a diamond are the small surfaces that are placed on the diamond by the cutter to give it is beautiful prismatic effect – they’re part of the quality of the diamond cut.

Beautifully cut and faceted diamonds will be bright with intense sparkle.

The Kwiat Cushion has an exceptional and classic brilliance without any unnecessary modifications to the faceting pattern.

The GIA report for a Kwiat Cushion describes the diamond as a “Cushion Brilliant”, which is considered the finest description for a cushion diamond.

But most diamonds in the market are faceted in an unattractive way, mainly with the goal of saving weight in the cutting process or to attempt to compensate for a general lack of brilliance.

These diamonds are typically described on the GIA report as “Cushion Modified Brilliant” and are simply not as finely cut.

The term Modified when used by the GIA or the industry is indicating that a non-traditional faceting pattern or extra facets were used in the cutting of the diamond.

Typically, these facets are on the underside of the diamond, and are intended to retain carat weight or to regain brilliance that is otherwise missing.

And as with many other poorly cut cushion shapes, this extra carat weight in the diamond makes it appear small for its size.

A common variation of the modified cushion is something often called “crushed ice.”

Now to be clear, this is NOT typically used as a positive description.

In crushed ice cushions, there are extra facets intended to give the diamond the appearance of additional brilliance – kind of like you’re looking into an ice cube that has cracked on the inside.

Now some sellers will try to position the crushed ice look as a positive, but the reality is that crushed ice cushions lack the proper, classic brilliance that a diamond ought to have.

It’s a visual trick that comes at the expense of beauty.

Some cushion diamonds are actually old stones, cut in a previous era. And others are more recently cut in the antique “Old Mine” style.

Some people have a preference for an antique style cut, and that’s a personal choice that is not necessarily right or wrong.

Antique style cushions typically have smaller table sizes, larger crown angles, an open culet and larger looking facets.

The overall brilliance is more subdued relative to a modern stone, consistent with the way that diamonds were cut in the 17 and 1800s.

There are many beautiful antique cushions – like the ones found at Fred Leighton for example.

But just as with modern cushion diamonds, there are also many examples of badly cut antique style cushions.

These diamonds are poor imitations and are attempting to mimic the true antique style in order to sell a lesser stone.

The Kwiat Cushion will typically look larger than an antique cushions and will have a more vibrant brilliance.

At Kwiat, all of our diamonds are cut to our rigorous technical and quality standards.

With more than 100 years of diamond cutting experience, we make certain that every diamond in every shape is cut to the be the most beautiful that it can be.

The Kwiat Cushion is the most beautiful and perfectly cut cushion shape diamond in the world.



Download the brochure for more information about our exclusive diamond.



The Kwiat Cushion makes a dazzling debut at the Couture 2021 show.



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We adhere to the strictest standards with unsurpassed honesty and integrity.

We maintain the highest standards for diamond procurement.

Trade in your center diamond for one of greater size and value.

All Kwiat diamonds are graded by the GIA and come with a GIA report.

From left to right: Cory, Greg, Lowell and Russell Kwiat


In 1907, Sam Kwiat started in the diamond jewelry business. He never imagined that his passion would take hold for generations to come. Together with his son, David, they grew a small family shop into a diamond legacy. More than a century later, the Kwiat family continues to design and craft the most exquisite diamond jewelry.

First Kwiat store on Canal Street in New York City, 1907

Today’s Kwiat flagship store on Madison Avenue in New York City


In 1907, Sam Kwiat started in the diamond jewelry business. He never imagined that his passion would take hold for generations to come. Together with his son, David, they grew a small family shop into a diamond legacy. More than a century later, the Kwiat family continues to design and craft the most exquisite diamond jewelry.


Our intention is to share our knowledge and expertise as we welcome you into the Kwiat family. An emphasis is placed on providing advice that fits your situation, with personal recommendations for selecting the right diamond jewelry for any of your special occasions. We take pride in our name and what it has come to stand for—diamond jewelry crafted with honesty and integrity. This is why customers keep coming back, generation after generation.



Will you be a classic bride, or are you dreaming of an engagement ring style that’s a bit edgier? Our Kwiat Tiara Diamonds — including the Kwiat Emerald Cut and Fred Leighton Round shown here — are cut to suit any style.

#diamondengagementring #emeraldcutdiamond #oldeuropeancut
Bezel-set bracelets, done two ways. We’d ask you to choose, but they look so good together...

#diamondbracelets #bezelsetting #diamondtennisbracelet
When choosing Mine to Shine, you can expect a luxury bespoke experience, complete with regular video updates of your diamond’s progress that culminate in a complete journey video. Watch here as Nikki’s Kwiat Cushion is transformed into her dream ring featuring a hidden halo and pavé band... and join us in wishing her and Saverio a lifestime of bliss!

#enegagementrings #engagementringideas #engagementringgoals
If your engagement ring is feeling lonely, why not give it some sparkly new right-hand friends? ✨ 

#cushioncutengagementring #cushioncutdiamond #engagementringgoals
Did you know today is National Chocolate Chip Day? We didn’t need an excuse to enjoy a sweet treat... but we’ll take it! 

#diamondring #diamondbracelet #nationalchocolatechipday
Gift your grad something they’ll cherish. A simple diamond pendant is the perfect starter piece for every jewelry collection, and it will be worn for a lifetime.

#diamondpendant #diamondnecklace
Sending love to all the moms and mother figures celebrating this Mother’s Day! 💐

Statement jewelry suggestion for all your spring and summer events. These stunning pear-shaped diamond drops are sure to make you the best-dressed guest! 

#weddingjewelry #diamondearrings #pearshapediamond


Our experts can answer all your questions about diamonds, help you choose a gift, or set up a virtual or in-person appointment.