A Comprehensive Guide to Octagon Diamonds

Author picture

Have a question? Not sure which one is the right diamond?

contact us

My Bottom Line Recommendation

I strongly recomend reading the full octagon diamonds guide below, however; if you’re just looking for the big takeaways, here’s what you need to know:

  • An octagon diamond is a diamond cut with eight sides, known for its unique geometric shape and exceptional sparkle.

  • Cut quality is essential to achieving a stunning octagon diamond as it influences the stone’s light performance, symmetry, and visual appeal.

  • For an ideal octagon diamond with high-light performance, look for a diamond with depth(%) 59-63 and table(%) 54-60. The settings are ready for you here with the diamonds filtered.

  • If you want to narrow down the octagon cut options and have the highest light performance with the most brilliance, sparkles, and fire, look for depth(%) 60-62, table(%) 56-58, crown angle 33.5-35.5, and pavilion angle 40.6-40.8. The settings are ready for you here with the diamonds filtered.

  • Recommendation: When buying an octagon diamond, prioritize a well-proportioned cut and good balance between other factors such as color, clarity and carat weight to ensure maximum brilliance. Always purchase from reputable jewelers such as this one who provide certification from recognized gemological laboratories like GIA or IGI.

Table of Contents

Are you considering an octagon diamond? With their sharp edges and unique geometry, octagon diamonds are becoming a bold choice for those seeking a twist on tradition. This article sheds light on their rise in popularity, intricacies of cut and design, and how they might just be the perfect pick for your next piece of jewelry—without spoiling the rich details you’ll uncover on why these gems are not just distinct, but deeply symbolic and expertly crafted.

Unveiling the Octagon Diamond

Have you ever laid eyes on an octagon diamond? This gemstone is a cut above the classic, with its eight mesmerizing sides offering a geometric elegance that demands attention. Whether it’s the centerpiece of an engagement ring or the sparkling accent of a pendant, the octagon shape stands out as an awe-inspiring spectacle in the world of diamonds. The allure of these gemstones isn’t just in their shape; it’s in their ability to transform any piece of jewelry into a modern masterpiece.

The octagon cut isn’t just for show; it embodies a unique appeal that sets it apart from its round counterparts. It represents the evolving tastes in jewelry, where bold lines and striking silhouettes take center stage. With each turn, the octagon diamond captures light and color in a dance that’s both sophisticated and refreshingly new.

what is an octagon diamond

A Cut Above: The Octagon's Unique Shape

The octagon cut is a marvel of gemstone engineering, with its eight sides crafting a striking appearance that outshines traditional round cuts. The abundance of facets—often more than the beloved round diamond—plays a pivotal role in unleashing the stone’s inherent brightness, turning every ray of light into a spectacle of fire and sparkle. This unique shape does more than dazzle; it creates a visual symphony that celebrates the octagon diamond’s unparalleled beauty.

Drawing inspiration from the Asscher cut’s step facets and geometric appeal, the octagon diamond nonetheless carves out its own identity. It’s the perfect union of meticulous craftsmanship and artistic vision, resulting in a gemstone that’s not only a testament to the cutter’s skill but also a beacon of modern design. Its fire and sparkle are a testament to the precision that goes into creating each facet, ensuring that the diamond’s performance under light is nothing short of extraordinary.

Symbolism and Significance

But the octagon diamond offers more than just a feast for the eyes. It carries with it a weight of symbolism, echoing notions of infinity, signaling renewal and rebirth. This makes it a particularly poignant and perfect choice for moments that mark new beginnings, like engagements or anniversaries. The octagon shape becomes not just a visual choice but a representation of a journey ahead, full of possibility and continuous growth.

In Chinese culture, the number eight is synonymous with wealth and prosperity, infusing an octagon diamond ring with layers of cultural significance. It’s a gemstone that not only enhances the beauty of its wearer but also carries a promise of fortune and success. Beyond its geometric allure, the octagon diamond holds a modern-day charm that speaks to aspirations of wealth and the continuous cycle of life.

Selecting Your Octagon Diamond: A Buyer's Guide

Choosing the perfect octagon diamond is akin to finding a rare treasure. It requires a deep understanding of the factors that contribute to the gemstone’s allure and brilliance. Here’s a comprehensive guide to help you make an informed decision:

Prioritize Cut Quality​ and Optimal Proportions

The cut of an octagon diamond is the most crucial determinant of its brilliance and ability to capture and reflect light. Aim for a high-quality cut that showcases the stone’s geometric elegance and maximizes its sparkle. A well-cut octagon diamond will have exceptional fire and scintillation, making it a standout piece.

Understanding the ideal proportions of an octagon diamond is essential to maximizing its beauty. Seek a diamond with the following proportions to ensure optimal light performance:

  • Table: 54-60%

  • Depth: 59-63%

  • Crown Angle: 32-36 degrees

  • Pavilion Angle: 40.5-41.4 degrees

For a high-end cut, focus on these refined ranges:

  • Table: 56-58%

  • Depth: 60-62%

  • Crown Angle: 33.5-35.5 degrees

  • Pavilion Angle: 40.6-40.8 degrees

These specific measurements will help you find an octagon diamond that offers maximum brilliance and sparkle.

shallow round diamond cut
ideal cut round diamond
deep round diamond cut

Carat Weight

The carat weight of an octagon diamond, while often associated with size, is also an indicator of value. Since octagon diamonds are rarer, they typically command higher prices. Balance carat weight with other quality factors to find a diamond that meets both your aesthetic and budgetary needs.

Consider Color and Clarity

When selecting an octagon diamond, prioritize color and clarity grades. A diamond with a color grade of H or higher and a clarity grade of VS2 or higher is recommended, as these grades provide an excellent balance of beauty and value. An eye-clean diamond, which appears flawless to the naked eye despite having minor inclusions visible under magnification, is ideal.

E vs G color diamond


Ensure that the octagon diamond you choose is certified by a reputable gemological laboratory, such as GIA or IGI. Certification guarantees the diamond’s quality, authenticity, and origin, providing peace of mind with your investment. (1,2)

When buying an octagon diamond, prioritize a well-proportioned cut and a good balance between color, clarity, and carat weight to ensure maximum brilliance. Always purchase from reputable jewelers who provide certification from recognized gemological laboratories.

By following these tips and conducting thorough research, you can find the perfect octagon diamond that captures your heart and offers excellent value.

Best Place To Buy an Octagon Diamond

When it comes to purchasing an octagon diamond, choosing a reputable online retailer is crucial for ensuring quality, competitive pricing, and a vast selection. One of the best places to buy an octagon diamond is from James Allen, known for its reliability, exceptional customer service, and commitment to providing high-quality diamonds at fair prices.

James Allen stands out with its industry-leading 360-degree premium video technology, allowing customers to inspect each diamond closely. This technology lets you see the diamond’s accurate color and any potential flaws, ensuring transparency and trust in your purchase. Unlike some other retailers, James Allen’s videos are renowned for their accuracy and reliability, providing peace of mind that what you see is exactly what you’ll receive.

octagon diamond front face up
octagon diamond side view

Mastering the Craft: Cutting Octagon Diamonds

The journey from rough stone to the mesmerizing octagon diamond is one of precision and artistry. Cutting this shape to perfection is a balancing act that optimizes the stone’s interaction with light, enhancing its brilliance and sparkle. With eight sides and additional facets when compared to traditional round cuts, the octagon diamond is a testament to the skill of the cutter who transforms it into a work of art.

Diamond cutting is a meticulous process. It involves:

  • Cleaving

  • Sawing

  • Bruting

  • Polishing

All to define the octagon diamond’s unique contours and facets. Each facet is crafted with the intent to amplify the gemstone’s brightness, ensuring that even under less than ideal lighting conditions, the diamond’s radiance is uncompromised. This careful crafting not only enhances the diamond’s beauty but also its ability to capture and reflect light in a way that truly sets it apart.


The Art of Faceting

The true magic of an octagon diamond lies in its faceting. The precise cuts result in a kaleidoscope of reflections that capture the eye and hold it in a dance of light and shadow. This mesmerizing effect is the signature of the octagon cut, and it’s what enhances its visual appeal beyond the ordinary. Each step-cut facet is strategically placed, optimizing the balance between brilliance and fire to create a gemstone that’s as lively as it is elegant.

During the cutting process, diamond cutters often use another diamond to shape the gemstone, ensuring that each of the typically 57 to 67 facets is polished to perfection. This results in a bold brilliance that defines the octagon diamond’s unique character. It’s a culmination of tradition and innovation, where age-old cutting techniques meet modern aesthetic demands to create a diamond that’s truly one of a kind.

The Importance of Proportions

Proportions in diamond cutting are like the notes in a symphony: they must be perfectly balanced to create harmony. The proportions of an octagon diamond are paramount in determining its brilliance and fire. The optimal combination of:

  • table size

  • crown angle

  • girdle thickness

  • pavilion depth

Proper proportions are essential in crafting a stone that maximizes brightness, sparkle, and light reflection, even in low light conditions. These proportions, including depth percentage and table size, are the unsung heroes that maximize light return and elevate the gemstone’s visual appeal.

The symmetry and balance of an octagon diamond’s proportions not only affect its luminosity but also its overall visual impact. When proportioned correctly, the stone’s facets work together to create a display of light that’s both breathtaking and unique to each individual diamond. It’s this detailed attention to proportions that ensures each octagon diamond is a masterpiece of light, capturing the essence of what makes these gemstones so special.

Octagon Diamonds in Jewelry Settings

The versatility of octagon diamonds shines through in their ability to adapt to a myriad of jewelry settings. From the sleek lines of a contemporary piece to the intricate details of a vintage heirloom, the octagon shape fits seamlessly into any aesthetic. Whether it’s the illusion of a tension setting or the secure embrace of a bezel, each setting is chosen to enhance the diamond’s unique geometry and ensure its longevity.

In choosing the right setting for an octagon diamond, one must consider how it will spotlight the gemstone’s distinct silhouette. This decision impacts not only the stone’s appearance but also its security and durability, especially in everyday wear. While not as commonly known, channel settings offer a sleek and secure home for octagon diamonds, adding a rare and distinctive touch to the jewelry landscape.

The Elegance of Solitaire Settings

A solitaire setting is where the octagon diamond truly stands out, its unique shape taking center stage, unadorned and unapologetically bold. The simplicity of this setting ensures all eyes are on the diamond, allowing its geometric beauty and brilliance to shine without distraction. It’s a testament to the notion that sometimes, less is truly more.

Versatile and timeless, solitaire settings for octagon diamonds are easily paired with other rings, creating a look that’s both cohesive and complementary. For those who appreciate understated elegance, the solitaire setting offers a way to highlight the natural allure of the octagon diamond without the need for additional embellishments.

Embracing Vintage Charm

Vintage settings are a gateway to the past, where luxury and charm reminiscent of old Hollywood reign supreme. An octagon diamond set in a vintage-inspired piece is a nod to the grandeur of bygone eras, with hand engravings and milgrain details that tell a story of elegance and opulence. It’s a style that transcends time, offering a hint of old-world luxury that’s as captivating today as it was decades ago.

The octagon diamond’s role in vintage settings is to enhance the overall design, bringing a modern twist to the classic look. It’s a harmonious marriage of past and present, where the clean lines of the octagon cut breathe new life into traditional jewelry styles.

Contemporary Styles: Halo and Pavé

In contemporary settings, the octagon diamond finds new expressions of style. A pavé setting, with its myriad of tiny diamonds surrounding the main stone, enhances the sparkle of the octagon cut, creating a dazzling display of light. Similarly, a halo setting adds volume and grandeur, often giving the illusion of a larger, rounder gemstone even from a distance.

The beauty of a halo setting is further accentuated by open galleries, allowing for decorative designs that showcase the underside of the octagon diamond. It’s a thoughtful detail that adds depth and complexity to the piece, ensuring that the gemstone’s brilliance is celebrated from every angle.

The Perfect Match: Pairing Octagon Diamonds with Metals and Accents

When it comes to enhancing the natural beauty of an octagon diamond, the choice of metal and accents plays a crucial role. Metals such as 14kt gold, 18kt gold, and platinum each offer a distinct backdrop that can complement the gemstone’s character, catering to a variety of styles and preferences. But the harmony doesn’t end with metal choices; accents like sapphires can turn a beautiful piece into a breathtaking one.

A halo of sapphires framing an octagon diamond is more than just a setting; it’s a statement. The deep blue of the sapphires provides a striking contrast that draws the eye inward, accentuating the diamond’s unique shape and the harmonious blend of color and sparkle that it brings to the piece. Whether it’s set in a bracelet, ring, or pendant, the versatility of octagon diamonds is evident in the array of metals they can pair with, from warm rose gold to sleek platinum.

Beyond Engagement Rings: Octagon Diamond Accessories

Octagon diamonds are not limited to the realm of engagements; they are versatile gemstones that can enhance a variety of accessories. Pendants, earrings, and necklaces adorned with octagon diamonds offer unique and stylish options that go beyond the traditional ring. Their rarity in ready-made collections often means that they are featured in custom pieces, allowing for personal touches that make each piece truly one-of-a-kind.

Imagine a pendant featuring an octagon diamond as the centerpiece, adding an unexpected twist to an otherwise classic accessory. Or envision earrings where the distinct shape of the octagon diamonds contributes to a cohesive and elegant ensemble, elevating the wearer’s style with their unique charm.

Conclusion - My Personal Experience

As a diamond consultant, I have had the pleasure of helping numerous clients find the perfect gemstone for their special occasions. The octagon cut diamond is an uncommon and exquisite choice, often selected by those who seek something truly distinctive. Its unique eight-sided shape and geometric elegance attract clients who want to maximize brilliance and sparkles in their jewelry.

From my experience, clients who choose octagon diamonds are often looking for more than just a beautiful stone—they seek a piece that stands out and reflects their personal style. The octagon cut’s ability to capture and reflect light in a dynamic, dazzling display makes it an exceptional option for anyone wanting to make a bold statement. Whether it’s for an engagement ring, a pendant, or a pair of earrings, an octagon diamond transforms each piece into a masterpiece of modern design.

I always recommend considering an octagon diamond if you’re looking to break away from traditional cuts and embrace a shape that symbolizes both sophistication and innovation. Its rarity and exceptional sparkle make it a remarkable choice for those who desire something special and different, ensuring your jewelry will be a standout piece in any collection.

Frequently Asked Questions

The octagon diamond is unique due to its eight sides and distinctive geometric elegance, creating a striking appearance with remarkable fire and sparkle.

Faceting of an octagon diamond is important because it enhances the gemstone’s visual appeal, creating a kaleidoscopic effect and contributing to its bold brilliance and distinctive character.

Yes, octagon diamonds can be set in vintage jewelry designs, adding a touch of old-world luxury with a modern twist, especially when paired with hand engravings and milgrain details.

When selecting an octagon diamond, look for factors like cut, clarity, and carat weight, and make sure it’s certified by a reputable gemological laboratory. This will guarantee its quality and authenticity.

No, octagon diamonds can be used in various accessories like pendants, earrings, and necklaces, offering unique and stylish options beyond engagement rings. They are versatile and suitable for different types of jewelry.

The emerald cut and octagon cut differ primarily in their shape, facet structure, and overall visual appeal. The emerald cut features a rectangular shape with truncated corners and uses step-cut facets. This creates a hall-of-mirrors effect, emphasizing the diamond’s clarity and depth over brilliance. The octagon cut, on the other hand, has eight sides and combines step cuts with additional facets, enhancing its sparkle and light reflection.


Let me do the hard work for you. Find the most valuable diamond within your budget, without waisting time or money.

My blog is reader-supported; when you purchase through links on my site, I may earn a commission at no additional cost to you. This enables me to provide you with free content.

Some retailers understand that the diamond buying process can be overwhelming. For that reason they are willing to share a portion of their profits with me if I can make this experience more simple for you.

In this partnership, you benefit from complimentary content and personalized consultations. If all sides are happy and you decide to buy, the retailer (and not you) compensates me.

While many diamond retailers have approached me, I hold the highest standards, choosing to collaborate only with those whose services and pricing I can confidently endorse. Your satisfaction and access to quality service are my top priorities. Therefore, you can trust that I maintain an unbiased perspective, without compromising the integrity of this blog.

Best Place to Buy Natural and Lab-Grown Diamonds

My no-nonsense reviews are based on my personal experiences, knowledge, and high standards. Explore my top-rated critiques of leading diamond sellers, curated to help you make the best choice.

Author: Yaniv Hadar

Looking For a Diamond? I'm On Your Side.

Find the most valuable diamond within your budget, without risking your money and wasting time on research.





Do you want help picking the best diamond?