Princess Cut Diamond Size Chart: Guide to the Perfect Selection
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Princess Cut Diamond Size Chart: Your Guide to the Perfect Selection

Princess Cut Diamond Size Chart: Your Guide to the Perfect Selection

When selecting a princess cut diamond, understanding the intricacies of its size and how it correlates with its appearance is crucial. I find that a diamond size chart tailored for the princess cut can be an invaluable tool. It provides a visual representation that helps me gauge the size of the diamond I may be considering. This is especially important for the princess cut, which is known for its sharp corners and square shape, since its size is often perceived differently when compared to round cut gems.

My experience tells me that the cut quality of a princess diamond greatly affects how large it appears when set in a piece of jewelry. Not all princess cut diamonds of the same carat weight look identical—dimensions and proportions play a significant role in their visual presence. The princess cut is a square brilliant cut, ideal for certain types of settings, requiring precise measurements for the best aesthetic and the size chart can help guide me through this process.

Understanding Princess Cut Diamonds

In my exploration of princess cut diamonds, I consider aspects such as historical context, distinctive attributes, and comparisons with other diamond shapes to provide a multifaceted perspective.

History and Origin

Princess cut diamonds have embarked on a relatively recent journey in the history of gemstones. Developed in the 1960s, the princess cut, or square modified brilliant, stands as a contemporary counterpart to the more traditional round brilliant cut. Initially, its creation aimed to retain more crystal weight from the rough diamond, which in turn enabled jewelers to offer a unique shape that stood apart from the classic round and fancy shapes like pear and heart.

Defining Features

The defining characteristics of a princess cut diamond are its sharp, uncut corners and a geometric square silhouette—a stylized blend of lines and edges. Its facet arrangement is optimized for brilliance, rivaling the traditional round cut. The top view, or table, exhibits a distinct cross-shaped pattern created by the specific facet alignment, making it instantly recognizable.

Table Layout:

  • Top (Table): Square with sharp corners
  • Facet Style: Cross-shaped pattern
  • Brilliance: High (close to round cut)

Comparing Princess Cut to Other Shapes

When comparing the princess cut to other diamond shapes, its most notable distinction is its angular form, which contrasts with the soft curves of round, pear, or heart shapes. The princess cut often appears larger than a round diamond of the same carat weight due to its extended diagonal measurement across the table. This attribute often leads to a preference for the princess cut in engagement rings, as it provides the elegance of high sparkle akin to a round cut but with a modern twist and often at a more accessible price point.

Comparison with Round Brilliant:

  • Princess: Angular edges, square silhouette, modern feel
  • Round: Curved edges, circular shape, classic and timeless

In conclusion, while other fancy shapes each hold their distinct appeal, the princess cut diamond captures a unique marriage of tradition and modernity with its brilliant sparkle and crisp lines.

Princess Cut Diamond Size Chart

princess cut diamond size chart shown in the picture.


In my experience, understanding a Princess Cut Diamond Size Chart is critical when selecting a stone, as it ensures the right balance between carat weight and how large the diamond actually looks. A well-proportioned princess cut diamond maximizes brilliance and value.

Reading the Chart

The Princess Cut Diamond Size Chart is a pivotal tool I use to determine the visible size of the diamond. It's important to look at the length-to-width ratio as it can affect the diamond’s overall appearance. An ideal ratio for a princess cut typically ranges from 1.0 to 1.05, indicating a square shape. Beyond just the ratio, the chart should also provide the side length in millimeters (mm), reflecting how the diamond will look from a top view.

Size to Carat Conversion

When discussing carat weight, I often reference a mm to carat or carat to mm conversion table. This subsection would be more effectively explained using a chart:

Carat weight directly influences the price, but it's important to remember it doesn't always accurately reflect size.

Common Measurements

For a well-informed purchase, knowing common measurements for princess cut diamonds is indispensable. For example, a 5mm princess cut diamond usually weighs about 0.75 carats. My clients often look for diamonds that appear large for their carat weight, which means they might seek a diamond that has a larger table, or top surface area, relative to its weight. Here’s a quick list for quick reference:

  • 0.5 carats: approximately 4.5mm
  • 1.0 carat: approximately 6.5mm
  • 1.5 carats: typically around 7.5mm

Accurate measurements ensure the stone fits perfectly in the desired setting.

Quality and Characteristics



Princess cut diamonds exhibit excellent brilliance and sparkle due to their numerous facets.


Cut Quality

The cut quality significantly affects the diamond's appearance and brilliance. Look for well-proportioned cuts for optimal sparkle.



Princess cut diamonds are available in various color grades, with colorless diamonds (D-F) being the most valuable.



Clarity refers to the presence of internal and external flaws in the diamond. Higher clarity grades (IF-VS) are desirable for better visual appeal.


Carat Weight

Princess cut diamonds can vary in carat weight, but larger diamonds are rarer and more valuable.

When assessing the quality of princess cut diamonds, I focus on three critical aspects: cut quality with precise parameters, color grading, and clarity, which includes the management of inclusions. Each of these plays a pivotal role in determining the overall appeal and value of the diamond.

Cut Quality and Parameters

To evaluate cut quality, I look at the specific cut parameters that influence a diamond's brilliance and fire. For a princess cut, optimal cut parameters include a table percentage that ranges from 64% to 75% and a girdle thickness that should be neither too thin nor excessively thick. The corners should be distinct yet not vulnerable to chipping. Princess cut diamonds have multiple facets—usually 58 or 76—which need precise alignment to enhance the diamond's ability to reflect light. The princess cut is a cutting style that demands high levels of polish and symmetry to achieve an eye-clean appearance. Cut grade assumes paramount importance, with the AGS and GIA both offering grading systems to determine if a diamond fits within ideal proportions.

Color Grading

Color grading for princess cut diamonds refers to the degree to which a diamond is colorless. Using the GIA scale, which ranges from D (colorless) to Z (light color), the most sought-after princess cut diamonds are those that fall within the D to F color range. This range denotes a high-quality stone that appears crisp and bright without any noticeable color to the naked eye. It’s important that I recommend only those diamonds that represent the true colors.

Clarity and Inclusions

Understanding clarity is about recognizing the presence of inclusions and how they affect the diamond. When I speak of clarity, I categorize diamonds according to the GIA's clarity scale, ranging from Flawless to Included. Princess cut diamonds often mask certain inclusions due to their unique facet pattern, making them a forgiving choice for those seeking an eye-clean look. However, inclusions near the corners might pose a risk to the stone's structural integrity. Whether considering lab-created or natural diamonds, it's essential to verify that the stone is certified to ensure accurate assessment of inclusions. For those particularly interested in clarity, I always suggest consulting a certification report from a reputable institution, like the GIA or AGS, to understand the specific nature and location of inclusions within the diamond.

Selecting the Right Setting

Close up view of Princess cut diamond ring.


Choosing the right setting for a princess cut diamond is critical, as it not only defines the ring's aesthetic but also ensures the diamond's security. The setting is the stage upon which the diamond performs, influencing both style and protection.

Role of Setting in Style and Security

I understand that the setting of a princess cut diamond profoundly affects the overall appearance of the ring. Solitaire settings, for example, highlight the diamond's shape and brilliance by allowing maximum light exposure. Beyond style, the setting's practical purpose is to secure the stone; the prong setting, with its metal claws, is designed to hold the diamond firmly in place, while carefully positioned French corners can protect the diamond's vulnerable points without obscuring its beauty.

Popular Setting Types for Princess Cut Diamonds

When I examine popular setting types for princess cut diamonds, I find that the solitaire and halo settings are particularly favored for engagement rings. These setting types are:

  • Solitaire Setting: Emphasizes the diamond, typically featuring four prongs that securely cradle the corners of the princess cut stone.

  • Halo Setting: Encircles the diamond with a collection of smaller stones, enhancing its size and sparkle.

Other setting types that suit princess cut diamonds include the Bezel setting, which encases the diamond's girdle with metal, securing even the thinnest of girdles and protecting the diamond's corners. Additionally, channel settings embed diamonds into the band, offering a sleek and modern appearance while safeguarding the stone's perimeter.

The Impact of Diamond Attributes on Price


Diamond Carat Weight

As carat weight increases, so does the price of the princess cut diamond.

💰 Higher carat weight ➡️ Higher price


Diamond Cut Quality

The precision of the cut affects the brilliance and fire of the diamond, impacting its price.

💎 Excellent cut ➡️ Higher price


Diamond Color Grade

Diamonds with less color are rarer and therefore more valuable.

💎 Colorless grade ➡️ Higher price


Diamond Clarity Grade

The absence of inclusions or blemishes contributes to a higher-priced diamond.

💎 Flawless grade ➡️ Higher price

When considering the purchase of a princess cut diamond, I recognize that specific attributes significantly influence the price. The carat weight of the diamond often serves as the most apparent indicator of price, but the quality of the cut, color, and clarity are also crucial in determining its final cost.

Carat Weight versus Price

Carat weight is the metric that defines the size of the diamond. I have observed a direct correlation between carat weight and price – as the weight increases, so does the price. This relationship is not always linear due to the rarity of larger diamonds. For instance, the price of a diamond that's twice the carat weight of another can be more than double.

Influence of Cut, Color, and Clarity

Beyond carat weight, the cut, color, and clarity of a diamond profoundly influence its brilliance and, subsequently, its price. A diamond’s cut guides its sparkle with a high-quality cut enhancing the diamond's brilliance and thus, often commanding a higher price. Diamond color is another key factor; the less color a diamond has, the higher its value, with colorless diamonds being the most sought after. Additionally, clarity refers to the absence of inclusions within the diamond. Diamonds with minimal or no inclusions are rarer and more valuable. When it comes to my budget, these factors allow me to balance between size and quality for the best value.

Engagement Ring Considerations

A beautiful princess cut engagement ring.


When I consider purchasing an engagement ring, I focus on both the stone's cut and the setting's style, ensuring they align with my partner's tastes and lifestyle. These elements, when chosen thoughtfully, contribute to the ring's lasting appeal and symbolic value.

Choosing a Princess Cut Engagement Ring

Princess cut diamonds are renowned for their modern, geometric look, combining the brilliance of a round cut with a contemporary square shape. When I choose a princess cut, I pay close attention to the quality of the cut, clarity, and color, knowing these aspects impact the diamond's sparkle. A size chart can be incredibly helpful to understand how different carat weights might look on my partner's hand.

Design Variations and Complementary Metals

The design and metal of an engagement ring band can accentuate the beauty of a princess cut diamond. White gold and platinum offer a sleek, modern appearance that enhances the stone's brilliance, while yellow gold provides a warm, classic setting. For those who appreciate a unique flair, vintage styles and settings like three-stone rings can offer distinctive alternatives. I consult with diamond experts to ensure that the combination of design features and metal types will showcase the princess cut to its best advantage.

Caring for Your Princess Cut Diamonds

Cleaning diamond ring with soft cloth.


In my extensive experience with gemstones, I've learned that maintaining the brilliance and longevity of princess cut diamonds requires consistent care. It's crucial to keep them clean and protected from potential damage to ensure they continue sparkling for years.

Maintenance and Cleaning

I make it a habit to clean my princess cut diamonds regularly to maintain their sparkle. A simple solution of mild dish soap and warm water works wonders. I soak my jewelry for about 20 to 30 minutes and then gently brush the diamonds with a soft-bristled toothbrush, getting into the crevices of the setting. It’s essential to rinse thoroughly with lukewarm water to remove any soapy residue. To dry, I pat them gently with a lint-free cloth.

For maintaining the polish and symmetry of the diamond, professional cleaning twice a year is advisable. A jeweler can help ensure the durability of the diamonds by checking for any loose settings and will typically use an ultrasonic cleaner for a deeper clean.

Protecting from Damage

When it comes to protecting my princess cut diamonds from damage, I am always mindful to avoid impact against hard surfaces that could chip the gemstone. Since princess cut diamonds can have sharp corners, they are more prone to snags and chips, particularly when set in bracelets and earrings that see frequent movement. I recommend using settings that protect the corners—like a v-prong setting—to safeguard against such damage.

Before doing any rigorous activity, I make sure to remove my diamond jewelry; this prevents any unwanted knocks or scrapes. I also have a dedicated fabric-lined jewelry box where I store my items separately to avoid scratches from other pieces. Regularly checking for loose stones can also prevent diamonds from falling out and becoming lost.

Remember, with the right care, my princess cut diamonds remain as captivating as the day I got them.

Additional Buying Tips

A man buying princess cut diamond ring.


When purchasing a princess cut diamond, my focus extends beyond size and aesthetics; I also prioritize validation through certifications and ensure transactions are made with reputable vendors.

Understanding Certifications

The sparkle of a princess cut diamond is not the only aspect that demands my attention. I consider a diamond grading report essential, which is often referred to as a certificate. This document is issued by reputable gemological laboratories such as the GIA (Gemological Institute of America), and it thoroughly analyzes a diamond's characteristics like cut, color, clarity, and carat weight. I ensure that the diamond I'm interested in comes with this certification as it attests to the gem's authenticity and quality.

Selecting a Reputable Vendor

When I start my search for the perfect diamond, selecting a trustworthy vendor is as crucial as the diamond itself. I look for vendors that demonstrate transparency and provide detailed information about their princess cut diamonds. For instance, James Allen is known for their high-resolution imagery and 360-degree videos which allow me to inspect my chosen diamond up close. This level of detail from a vendor gives me confidence in the diamond's quality and in my purchase.

Princess Cut Diamonds in Popular Culture

kate bosworth princess cut diamond ring shown in the picture with her partner.


Princess cut diamonds have captivated the attention of pop culture, embodying sophistication and modern elegance. They've graced the fingers of celebrities and become synonymous with high-profile engagements.

Notable Wearers

  • Kate Bosworth truly dazzled when she showcased her magnificent princess cut diamond ring. This piece became a significant nod to the contemporary style of the princess cut, further solidifying its position in popular culture.
  • Emily Ratajkowski combined the traditional with the bold in her choice of a two-stone engagement ring, featuring a princess cut diamond. Her selection reflects the versatility of this cut, appealing to those who defy convention while cherishing classic elegance.

The influence of princess cut diamonds in popular culture remains indisputable, with their clean lines and chic silhouette being a staple among style icons.

Understanding the Market



Environmentally friendly


Ethically sourced

Chemically identical to natural diamonds



Lack of rarity

Perceived as less valuable

Potential quality variations

Depreciation in value over time

In this section, I'll guide you through the essential aspects of the diamond market, focusing on the nuances between lab-grown and natural diamonds and the prevailing preferences among buyers.

Lab Diamonds versus Natural Diamonds

Lab diamonds, also known as synthetic or cultivated diamonds, are identical to natural diamonds in their chemical, physical, and optical properties. What differentiates them from their natural counterparts is their origin. Natural diamonds are mined from the earth, often involving a significant amount of rough diamond waste, while lab diamonds are created in controlled environments. The yield from creating lab diamonds is generally higher with less waste, making them a more environmentally friendly option.

  • Pros of Lab Diamonds:
    • Environmentally conscious: less ecological damage.
    • Cost-Effective: lower price point compared to similar quality natural diamonds.
  • Cons of Lab Diamonds:
    • Perception: some buyers prefer the traditionalism and romance associated with natural diamonds.
    • Resale Value: potential for lower resale value compared to natural diamonds.

Current Trends in Diamond Buying

The diamond market is always evolving, and recently there has been an increased interest in fancy cut diamonds, such as the Princess cut. This particular style has seen popularity due to its modern look and the fact that it often presents a slightly lower price point than the classic round cut for a similar carat weight and quality.

  • Preference for Fancy Cuts:
    • Princess Cut: chosen for its unique brilliance and sharp angles.
    • Melee Diamonds: small diamonds, often used to accentuate a larger stone, seeing increased use in various settings.

Buyer trends also show a growing awareness and concern for ethical sourcing and the environmental impact of mining. This awareness is leading to a steady rise in demand for lab diamonds, which promise less environmental strain than mining for natural diamonds.

Technical Considerations

Diamond anatomy shown in the picture


In approaching the technical considerations for a Princess Cut Diamond Size Chart, I must emphasize the importance of meticulous craftsmanship. This precision ensures maximum yield and optimal beauty in the finished gem.

Calculating Optimal Yield from Rough

When I assess the potential yield of a natural rough diamond, my aim is to maximize the carat weight while preserving the stone's innate sparkle and brilliance. Efficient cutting practices are crucial to avoid unnecessary waste. Here's a simplified method I use:

  1. Examine the rough: Identify the diamond's natural shape to determine the most advantageous cut.
  2. Plan the cut: I calculate the estimated weight loss to aim for the highest yield without compromising quality.
  3. Implement precise cuts: By strategically shaping the diamond, I ensure that the majority of the rough is retained.

It's important to note that the average yield from a rough diamond to a polished princess cut is typically around 60-70%.

Physical Properties of Princess Cut Diamonds

The Princess Cut is distinguished by its sharp angles and contemporary style, making it a sought-after choice for modern fine jewelry. I pay close attention to the following properties:

  • Depth percentage: This measures the height of the diamond relative to its width. An optimal balance ensures a vibrant sparkle.
  • Crown and Pavilion: The crown (top) and the pavilion (bottom) must work in harmony to reflect and refract light effectively. I ensure these parts are cut to precise angles, fostering a breathtaking display of light.

Depth and table percentages, along with the meticulous crafting of the crown and pavilion, lead to the desired brilliance Princess Cut Diamonds are renowned for.

Engagement ring on sale

Frequently Asked Questions

In this section, I'll be covering some of the common inquiries about princess cut diamond sizes, their dimensions in relation to carat weight, and how they appear in different settings.

How can I determine the millimeter dimensions of a princess cut diamond based on its carat weight?

To estimate the size in millimeters for a princess cut diamond based on carat weight, you can refer to a size chart specific to this diamond cut. Keep in mind, though, that millimeter dimensions can vary slightly due to differences in cut proportions.

What is the appearance of different princess cut diamond sizes when worn on the hand?

Different princess cut diamond sizes can range from subtle to striking when worn. A small size, such as 0.5 carat, offers a delicate aesthetic, whereas larger sizes, like 2 carats, create a more prominent and bold statement on the hand.

Can you explain how carat weight correlates to the actual size of a princess cut diamond?

Absolutely. The carat weight of a princess cut diamond has a direct but nonlinear relation to its size; as the carat weight increases, the millimeter dimensions grow as well, but not proportionally. A larger carat weight will result in a bigger diamond, but the increase in size is less per carat as the carat weight goes up due to the diamond's depth.

What are the typical dimensions for a 1 carat princess cut diamond?

Typically, a 1 carat princess cut diamond will have dimensions in the range of 5.5mm x 5.5mm. However, the exact measurements can vary slightly based on the diamond's cut proportions.

How does a princess cut diamond's size visually compare to that of an emerald cut?

A princess cut diamond typically appears smaller than an emerald cut diamond of the same carat weight because the princess cut has a deeper pavilion and therefore a smaller table surface.


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