If you’re in the market for a diamond that stands out—without being over-the-top—the 8.17×5.64×3.52 mm size might just hit that sweet spot. It’s elegant, elongated, and packed with visual presence. Whether you’re shopping for an engagement ring, a pendant, or a pair of stunning earrings, this diamond size brings together sparkle, sophistication, and just the right amount of boldness.
Let’s break it all down in this guide—what those measurements really mean, the best shapes and settings, pricing, pros and cons, and how to make sure you’re getting exactly what you’re paying for.
What Does 8.17×5.64×3.52 mm Actually Mean?
These dimensions represent:
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Length: 8.17 mm
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Width: 5.64 mm
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Depth: 3.52 mm
Essentially, this diamond has a long, rectangular profile. The length-to-width ratio creates an elongated look that flatters the hand and gives the illusion of a bigger stone without requiring an overwhelming carat weight.
Bonus: The shallower depth means more surface area—so the diamond looks larger when viewed from above.
Estimated Carat Weight: How Big Is It, Really?
While carat weight can vary based on cut quality and density, a diamond measuring 8.17×5.64×3.52 mm typically falls between 1.30 and 1.50 carats.
This is an ideal range for most buyers: large enough to make a statement, yet comfortable for everyday wear. It’s popular for engagement rings and timeless enough for heirloom-style pieces.
Best Diamond Cuts for This Size
The shape of a diamond can completely change how it looks—and how it sparkles. Here are the most popular cuts that shine in this size range:
1. Radiant Cut
Radiant-cut diamonds combine the brilliance of a round stone with a rectangular shape. This faceting style maximizes sparkle and hides inclusions well—great if you’re going for size and shine over perfection.
2. Emerald Cut
Emerald cuts are all about clarity and elegance. Their long, sleek lines draw attention to the stone’s natural beauty. In this size, an emerald cut gives off refined, Art Deco vibes—perfect for someone who appreciates understated luxury.
3. Elongated Cushion Cut
If you love a vintage-meets-modern aesthetic, the elongated cushion cut is your best friend. It’s romantic, soft around the edges, and makes great use of the 8.17×5.64 dimensions.
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Ideal Settings That Highlight This Size Diamond
The setting you choose can either elevate or overshadow your diamond. Here are three styles that work beautifully with this particular size:
Solitaire Setting
Classic and timeless, the solitaire lets the diamond take center stage. The elongated shape pops against a minimal setting, giving your ring that sleek, modern feel.
Halo Setting
A halo of smaller diamonds around your center stone adds extra sparkle and makes the diamond look larger. It’s a great choice if you want a lot of shine without jumping up in carat size.
Three-Stone Setting
Symbolizing the past, present, and future, this style is both meaningful and dramatic. The center 8.17×5.64×3.52 mm diamond gets a boost from two side stones, creating a balanced, standout piece.
Color and Clarity: What’s Best for This Size?
With a larger surface area, color and clarity become more noticeable—especially in cuts like emerald or radiant.
Color Grades
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G-H color: A sweet spot—near colorless but more budget-friendly than D-F.
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D-F color: Offers an icy, crisp look—ideal for white gold or platinum settings.
Clarity Grades
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Emerald cuts show flaws more easily, so aim for VS1 or better.
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Radiant/cushion cuts are more forgiving, so SI1 or higher can still look flawless to the naked eye.
Always request high-res images or videos—or view the stone in person—before buying.
Natural vs Lab-Grown: Which One’s Right for You?
This is one of the biggest decisions you’ll make—so here’s a breakdown:
Natural Diamonds
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Formed over millions of years
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Higher resale value
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Symbolic and traditional
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More expensive—especially in this size
Lab-Grown Diamonds
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Created with advanced technology
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Chemically and physically identical to natural stones
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Roughly 50% cheaper
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Eco-friendly and conflict-free
Bottom line: If budget or ethics are top of mind, lab-grown may be the better pick. If legacy and rarity matter more, go natural.
Price Range: What Should You Expect to Spend?
Pricing can vary based on origin, cut quality, certification, and more.
Estimated Price Breakdown:
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Natural Diamonds: $7,000 – $15,000
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Lab-Grown Diamonds: $1,500 – $4,000
Don’t forget to factor in costs for the setting, design customization, and shipping if you’re buying online.
Always Check for Certification
When investing in a diamond of this size, certification is non-negotiable.
Look for:
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GIA (Gemological Institute of America): Gold standard for natural diamonds.
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IGI (International Gemological Institute): Trusted for lab-grown diamonds.
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AGS (American Gem Society): Known for grading light performance.
Certificates confirm cut, clarity, color, and carat weight—plus it protects you from overpaying.
Double-Check the Measurements
Never assume—always verify that your diamond actually measures 8.17×5.64×3.52 mm.
Ask for the official dimensions on the grading report, or have a jeweler use a caliper to confirm. This is especially important for custom designs or online purchases.
Jewelry Styles That Work Best with This Diamond
This diamond size isn’t just for rings. Its elongated shape and surface sparkle make it incredibly versatile:
Engagement Rings
Slimming and bold at the same time. Whether it’s a solitaire or a vintage-inspired halo, the proportions are flattering on every finger.
Pendants
Perfect as a centerpiece in a minimalist or halo pendant. It hangs beautifully and catches light with every move.
Earrings
Match two for radiant drop earrings or modern studs. The size adds drama, while the length elongates the neck.
Diamond Care Tips: Keep It Sparkling
Diamonds are tough—but not invincible. Here’s how to keep your 8.17×5.64×3.52 mm stone in top shape:
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Clean it regularly with a soft toothbrush and gentle jewelry cleaner.
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Avoid harsh chemicals, especially while cleaning or swimming.
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Get it checked every 6–12 months to ensure prongs and settings are secure.
Where to Buy: Trusted Retailers for Peace of Mind
Whether shopping in-store or online, go with reputable jewelers who offer:
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HD video previews
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Certification transparency
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Flexible return policies
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User reviews and ratings
Top retailers to consider:
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Blue Nile
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James Allen
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Brilliant Earth
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Local GIA-certified jewelers
Final Thoughts: Is the 8.17×5.64×3.52 mm Diamond Right for You?
If you’re looking for a diamond that feels luxurious, looks larger than it weighs, and adapts beautifully to any setting—the 8.17×5.64×3.52 mm diamond delivers on all fronts.
It’s perfect for modern romantics, lovers of clean lines, or anyone wanting a bold look that still feels timeless. Whether natural or lab-grown, radiant or emerald-cut, this stone has the versatility and charm to shine in any jewelry box.
