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A 13 carat diamond ring is a masterpiece of brilliance and luxury — the kind of jewellery that captures admiration and symbolises distinction. Its size, fire, and sparkle make it an unforgettable statement of success and commitment. The 13 Carat Diamond Ring Price for a top-tier lab-grown diamond — colourless (D–F), VS–VVS clarity, excellent cut, set in solid 14KT gold and certified by IGI — ranges between $20,000–$21,500 USD or £16,400–£17,620 GBP.
Choosing a diamond this size represents more than just beauty — it’s an emotion, a reflection of personal milestones, and refined taste. In this guide, you’ll discover everything you need to know about buying a 13 carat lab diamond ring: from its real-world dimensions and price determinants to carat comparisons, shapes, settings, and customisation options. Whether you’re investing in an engagement ring or an heirloom piece, this blog helps you find timeless elegance that perfectly fits your story.
How Big is a 13 Carat Lab Diamond? (Measurements Explained)
When people ask, “How big is a 13 Carat Diamond?”, the answer depends on how weight translates to visible size. Carat refers to weight, not physical spread — one carat equals 200 milligrams, so a 13 carat diamond weighs roughly 2.6 grams. However, millimetre size varies with shape and cut proportions.
A Round Brilliant 13 carat diamond typically measures around 15.1–15.3 mm in diameter, providing breathtaking surface sparkle. However, different shapes alter perception — oval and pear appear larger due to their elongated faces, while cushion and Asscher cuts seem smaller since more carat weight lies in the depth.
| Carat Weight | Approx. Diameter (Round Brilliant, mm) |
|---|---|
| 1 ct | 6.4 mm |
| 2 ct | 8.2 mm |
| 3 ct | 9.3 mm |
| 4 ct | 10.2 mm |
| 5 ct | 11.2 mm |
| 6 ct | 11.8–12.0 mm |
| 7 ct | 12.4–12.7 mm |
| 8 ct | 13.0–13.2 mm |
| 9 ct | 13.5–13.7 mm |
| 10 ct | 14.0–14.2 mm |
| 12 ct | 14.8–15.0 mm |
| 13 ct | 15.1–15.3 mm |
Remember, visual scale grows with surface area, not weight — a 2 ct diamond appears about 50% larger than a 1 ct. Thus, while a 13 ct diamond radiates grandeur, its proportions and setting ensure it remains graceful and wearable.
How Much is a 13 Carat Diamond Ring Price and Worth?
A 13 Carat lab-grown diamond ring can range between $20,000–$21,500 USD or £16,400–£17,620 GBP, depending on cut, clarity, colour, and overall craftsmanship. At this luxurious size, quality details play an even more essential role in brilliance.
The diamond’s worth is shaped by the 4Cs:
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Cut: Affects luminosity; go for “Excellent” or “Ideal.”
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Colour: Opt for D–F grades for clear, colourless beauty.
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Clarity: Choose VS–VVS for a flawless appearance.
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Carat: Beyond size, precision matters for proportion and balance.
Lab-grown diamonds offer equal allure to mined diamonds but at nearly half the cost. They’re sustainable, conflict-free, and IGI-certified for grade accuracy. Their large-carat availability makes them ideal for bold designs that blend value, ethics, and elegance.
Learn more: Lab Grown Diamonds
12 Carat vs 13 Carat vs 14 Carat Lab Grown Diamond Ring Price Comparison
When deciding between neighbouring carat sizes, it’s helpful to evaluate size differences and costs side-by-side.
| Carat Weight | Avg. Size (mm) | Price Range (USD) | Other Popular Shapes | Lifestyle Fit |
|---|---|---|---|---|
| 12 ct | 14.8–15.0 mm | $18,000 – $20,000 | Oval (faces bigger), Cushion (romantic glow), Princess (edgy brilliance) | Refined yet impactful |
| 13 ct | 15.1–15.3 mm | $20,000 – $21,500 | Round (classic brilliance), Oval (elongated elegance), Emerald (crisp symmetry) | Balanced luxury, versatile style |
| 14 ct | 15.5–15.7 mm | $21,500 – $23,000 | Pear (elongates finger), Radiant (modern shimmer) | Bold, fashion-forward confidence |
Price differences between these carat levels amplify due to rarity rather than simple weight. Interestingly, oval or radiant cuts can maximise the face-up size, allowing you to enjoy the visual effect of a higher carat at a moderate price. Consider your lifestyle: choose 12 ct for simplicity and balance, 13 ct for luxury harmony, or 14 ct for high-impact glamour.
Which Diamond Shapes are Best for 13 Carat Engagement Rings?
For a 13 carat engagement ring, shape dramatically influences the diamond’s presence and style. Here are the top five to consider:
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Round Brilliant: Maximises scintillation with unrivalled sparkle.
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Oval: Looks larger per carat, elongating the hand elegantly.
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Princess: Bold, angular edges for a modern and structured appeal.
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Cushion: Romantic and soft, perfect for vintage-inspired designs.
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Emerald: Step-cut sophistication highlighting clarity and precision.
Round diamonds remain the premium choice, commanding the highest cost. Meanwhile, fancy cuts like oval and cushion offer great value and distinctive style, letting you capture elegance and individuality within your budget.
Explore more: Engagement Rings Collection
Best Buying Tips for 13 Carat Lab Diamond Rings
Investing in a 13 carat lab diamond ring should be both thoughtful and exciting. Keep these expert tips in mind:
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Prioritise cut — brilliance defines quality more than carat.
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Choose colourless (D–F) for timeless white radiance.
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Stick to VS–VVS clarity for flawless sparkle.
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Lab diamonds = 40–60% savings with identical beauty.
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Match your shape to your hand type and daily lifestyle.
For example, an oval-cut 13 ct diamond can appear as large as a 14 ct round and maintain an elegant profile — a perfect match of sophistication and value.
Use our guide to ensure the perfect fit: Find Your Ring Size
Popular Settings for 13 Carat Diamond Rings
Choosing the right setting enhances your diamond’s brilliance and security.
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Solitaire: Pure simplicity focusing all attention on the diamond.
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Halo: Adds sparkle and magnifies stone size.
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Pavé: Creates a stream of light along the band.
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Three-Stone: Symbolises past, present, and future.
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Minimalist: Subtle sophistication for modern tastes.
Settings like Halo or Pavé maximise visual size, while Solitaire emphasises timeless classicism.
Image Alt: 13 Carat Diamond Ring in Halo Setting
Custom-Made 13 Carat Lab Diamond Rings
Every 13 carat diamond is unique — customising your ring ensures your design is too. By going custom, you can blend budget control with personalised craftsmanship.
We offer loose diamond selection, 3D CAD design previews, and handcrafted settings to make your concept a reality. Our artisans craft each ring with precision, from choosing the stone to final polishing.
Begin your journey here: Custom Jewelry
Work with us to create a one-of-a-kind 13 Carat diamond ring that tells your story.
FAQs about 13 Carat Diamond Rings
How much does a 13 Carat diamond ring cost?
$20,000–$21,500 USD or £16,400–£17,620 GBP, depending on cut and setting design.
How big is a 13 Carat diamond in mm?
A round 13 ct diamond measures around 15.1–15.3 mm across.
Is a 13 Carat diamond too big for engagement?
Not at all — it’s dramatic yet sophisticated with the right setting.
Are 13 Carat lab-grown diamonds cheaper?
Yes, 40–60% less than mined diamonds of the same quality.
What setting makes a 13 Carat diamond look larger?
Halo and oval settings can make it face up even bigger.
Conclusion
A 13 carat lab-grown diamond ring is a celebration of grandeur, craftsmanship, and modern luxury. It’s a bold yet elegant choice for those who appreciate meaningful design and brilliant presence. By choosing a lab-grown diamond, you invest in sustainable beauty, superior value, and timeless elegance without compromise.
At Gilibili, we bring every diamond dream to life with expert craftsmanship and certified precision. Discover our spectacular 13 Carat Diamond Rings and find the one that tells your unique story.Shop Now → https://gilibili.com/pages/engagement-rings
Get instant advice via WhatsApp at +91 8200212331 - click to chat for (instant reply) or email hello@gilibili.com (reply within 2 days). Whether you’re seeking a loose diamond, designing a bespoke masterpiece, or choosing your ideal engagement ring — we’re here to create brilliance that lasts forever.