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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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Fred Leighton Round Engagement Rings

FRED LEIGHTON ROUND®
ENGAGEMENT RINGS

The Old European Cut, Perfected

We evolved a beloved cut from the 1890s, using modern technology to create consistent dimensions that make the diamond look bigger and brighter. It has all the charm of an antique, and all the precision of a contemporary cut.

A CLOSER LOOK

View Transcript

My name is Greg Kwiat and I want to help you learn everything you need to know to buy a diamond. I’d like to introduce you to the Fred Leighton Round, the old European cut diamond perfected. Let’s explore what makes the Fred Leighton round extraordinary and how we have perfected the art of cutting this classic shape. The old European cut diamond is round in outline and has a distinctly different fastening and brilliance from the modern round brilliant. The old European has a softer antique style brilliance and the appearance of larger facets typical of diamonds cut at the turn of the 19th to 20th century, a period where diamonds were meant to sparkle by candlelight. Today, the old european cut appeals to those who love the vintage style and appreciate the historical beauty of an antique cut diamond. With over 100 years of diamond cutting skill and experience, we set out to evolve the old european cut of the 1890s with contemporary technology and consistent dimensions. The result is the Fred Leighton Round, the perfected old european cut. Unlike most original old Euros, the Fred Leighton round is perfectly round and outlined with precise facets and proportions. The Fred Layton round has a slightly larger table and a smaller, more refined culit than the original counterparts, which works to achieve a more attractive and harmonious balance. All Fred Leighton rounds receive excellent polish and excellent symmetry from the GIA, a rarity for diamonds of this shape. The Fred Leighton round will appear larger in size for the same carat weight and will appear whiter than its GIA color grade. With our proprietary standards and proportions, the Fred Leighton Round is the perfect combination antique charm and contemporary precision.

THE MARK OF PERFECTION

We laser-inscribe the diamond’s girdle with our Tiara logo, a hallmark of four generations of expertise, craftsmanship, and trust. And today, it means even more: an assurance that our diamonds are natural, conflict-free, and ethically sourced from known origins.

THE WORLD’S MOST PERSONAL DIAMOND

We’ll help you select a natural, conflict-free, and ethically mined rough diamond and invite you to follow along as its cut and set in a handcrafted ring designed to your specifications. Or, you may choose a diamond that’s already been cut or a completed ring.

learn more

Round Choose your rough

Round Cut to perfection

Round CRAFTED FOR YOU

RESPONSIBLE AND TRANSPARENT

Every Kwiat Tiara diamond is cut from the rough stone by Kwiat and can be traced to its country of origin. This guarantees that the diamond is conflict free and sustainably and ethically mined.

GIVING BACK

When you choose a Kwiat engagement ring, you are also supporting our contributions to charity: water, an organization that provides clean water to people around the world. Every diamond ring sold provides water for an entire family.

BUILDING A
BRILLIANT LEGACY

Kwiat is a family business with a heritage of service, quality, and integrity. Guided by these values, Kwiat has flourished, blossoming like the family name, which means “flower” in Polish.

In 1907, Sam Kwiat opened a diamond shop in New York City; he was joined by his son, David, in 1933. Today, Kwiat has grown to become a renowned brand led by David’s son, Lowell, and his grandsons, Greg, Cory, and Russell. Like their forebears, they have perfected the science and art of cutting diamonds. And they continue the tradition of trust and authority that Sam Kwiat established more than a century ago.

CUSTOMERS ARE FAMILY

As we welcome you into the Kwiat family, we’ll share our knowledge and expertise. We will gladly provide advice that suits your situation and budget, with personal recommendations for the perfect diamond jewelry for any special occasion. We take pride in our name and what it has come to stand for. And we are grateful that customers and their families return to us again and again, generation after generation.

SEE OUR HISTORY TIMELINE


A DAILY DOSE OF BRILLIANCE

This charm radiates joy and confidence, just like Leo babies themselves.

#leo #diamondpendant
Multi-row huggies are the perfect earring for every day... a little extra diamond 💎 power never hurt anyone. 

#diamondhuggie #diamondhoops
Popped into our Madison Avenue flagship to try on some essential accessories, just in time for tennis season. 🎾

#tennisbracelet #linebracelet
Old European cut diamonds are charming and romantic, but they’re difficult to find with qualities that meet our standards. Our Fred Leighton Rounds feature precision-cut facets and consistent dimensions that reveal a bigger and brighter diamond. Like a family heirloom — but better.

#oldeuropeancut #oldeuropeancutdiamond
The newest styles in our Starry Night collection highlight star-set diamonds that orbit the neck like a miniature twinkling galaxy. 💫

#diamondnecklace #neckmess
Consider color for your summer jewelry looks! Our Argyle collection offers timeless charm, blending vintage details with modern sophistication.

#diamondbangle #braceletstacks #diamondring
Natalie Portman is radiant at tonight’s SAG-AFTRA screening of “Lady In The Lake” in our diamond Orbit Huggies. ✨
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