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A 1.5 carat diamond ring embodies a perfect harmony of brilliance, size, and sophistication — it’s a favourite among those who want a noticeable sparkle without venturing into oversized luxury territory. The 1.5 Carat Diamond Ring Price for a premium-quality lab-grown diamond with VS–VVS clarity, colorless grade (D–F), excellent cut, set in solid 14 kt gold with IGI certification, ranges from $2,000 to $2,500 USD (£1,640 – £2,050 GBP). This makes it an ideal carat weight for engagement rings or milestone celebrations, as it delivers luxury at an accessible price point.
In this guide, we’ll cover everything you need to know about the 1.5 carat lab diamond ring — including its size, worth, comparisons with other carat weights, shapes, popular settings, buying tips, and even custom-made options. By the end, you’ll have a clear understanding of what makes 1.5 carats one of the most balanced and desirable diamond sizes.
How Big is a 1.5ct Lab Diamond? (Measurements Explained)
If you’re wondering, “How big is a 1.5 Carat Diamond?”, picture a round brilliant diamond that measures approximately 7.4 mm in diameter. The 1.5 carat stone appears significantly larger than a 1 carat (6.4–6.5 mm) but not overwhelmingly large, making it a perfect sweet spot between minimal and dramatic.
A diamond’s carat refers to its weight, not its visible size. 1 carat = 200 milligrams, so a 1.5 carat diamond weighs roughly 300 milligrams. While size increases with weight, different shapes distribute this weight differently. Oval and pear diamonds appear larger for their carat due to their elongated spread, whereas cushion cuts tend to look smaller because of their deeper profiles.
Average Diamond Size Chart (Round Brilliant)
| Carat Weight | Avg. Size (mm) |
|---|---|
| 0.5 ct | 5.0 mm |
| 1.0 ct | 6.4–6.5 mm |
| 1.5 ct | 7.4 mm |
| 2.0 ct | 8.1–8.2 mm |
| 3.0 ct | 9.3 mm |
It’s important to note that a 2-carat diamond doesn’t look twice as big as a 1-carat diamond; it appears only about 50% larger due to how proportions scale in three dimensions. That’s why 1.5 carats often deliver optimal finger coverage and visual balance.
How Much is a 1.5 Carat Diamond Ring Price and Worth?
The 1.5 Carat Diamond Ring Price typically ranges from $2,000 – $2,500 USD (£1,640 – £2,050 GBP) for the finest quality lab-grown diamonds graded D–F colour, VS–VVS clarity, excellent cut, and IGI certification. These diamonds are set in durable 14 kt gold, making them both luxurious and practical.
A diamond’s worth is determined by the 4Cs:
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Cut – The most critical factor; an excellent cut maximises sparkle.
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Colour – D–F ensures a colourless, crisp, pure look.
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Clarity – VS–VVS represents near-perfect internal composition.
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Carat – The size that delivers presence and value balance.
Compared to natural diamonds, lab-grown alternatives are 40–60% more affordable and identical in composition. They are also sustainable and responsibly created, making them the modern choice for conscious buyers. Learn more about these eco-friendly gems in our Lab-Grown Diamonds guide.
1 Carat vs 1.5 Carat vs 2 Carat Lab Grown Diamonds Ring Price Comparison
Comparison Table
| Carat Weight | Avg. Size (Round Brilliant, mm) | Price Range (USD $) | Other Popular Shapes | Lifestyle Fit |
|---|---|---|---|---|
| 1.0 ct | ~6.4–6.5 mm | $1,500 – $2,000 | Oval (faces bigger), Cushion (soft glow), Princess (modern square edges) | Timeless, affordable elegance |
| 1.5 ct | ~7.4 mm | $2,000 – $2,500 | Round (classic brilliance), Oval (elongated), Emerald (clean elegance) | Balanced size, refined luxury |
| 2.0 ct | ~8.1–8.2 mm | $2,500 – $3,000 | Round (statement), Pear (elongates finger), Radiant (bold sparkle) | Show-stopping, confident charm |
Price jumps between carat weights aren’t linear — larger carats carry a rarity premium, especially for flawless cuts. Shapes also influence perceived size; ovals and pears appear larger for the same carat weight, while radiant and elongated cushions create the illusion of length. If you want understated elegance, go for 1 ct; for balanced beauty, pick 1.5 ct; for bold luxury, 2 ct makes a statement.
Which Diamond Shapes are Best for 1.5 Carat Engagement Rings?
The 1.5 carat size beautifully suits a range of shapes, each offering a unique look:
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Round Brilliant – Most popular; maximises sparkle and symmetry.
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Oval – Appears larger and elongates the finger.
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Princess – Square brilliance with a modern twist.
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Cushion – Soft, vintage-inspired romantic shape.
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Emerald – Step-cut sophistication that highlights clarity.
Round shapes tend to have a higher price per carat, while fancy cuts like oval, cushion, and emerald often provide better value. Explore your ideal style by browsing our Engagement Rings Collection.
Best Buying Tips for 1.5 Carat Lab Diamond Rings
To get the most value from your 1.5 carat diamond purchase, consider the following:
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Prioritise an excellent cut for the most brilliance.
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Choose D–F colourless lab diamonds for pure white sparkle.
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Stick with VS–VVS clarity for eye-clean beauty.
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Remember: Lab-grown stones are 40–60% more affordable.
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Match shape to your hand proportions for perfect visual balance.
Example: A bride chose a 1.5 carat oval-cut lab diamond because it offered a larger appearance than a round of the same weight, fitting her budget while maintaining a luxurious look. Use our Ring Size Guide to measure perfectly before ordering.
Popular Settings for 1.5 Carat Diamond Rings
The setting strongly influences both style and size perception. Top choices include:
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Solitaire – Classic focus on the single stone.
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Halo – Adds small diamonds for more brilliance and a larger look.
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Pavé – Sparkling band amplifies luxury.
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Three-stone – Represents past, present, and future.
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Minimalist – Clean, elegant, and modern.
Example alt text: “1.5 Carat Diamond Ring in Halo Setting.”
Each setting can subtly enhance or balance the visual weight of your diamond, especially when paired with shapes like oval or radiant.
Custom-Made 1.5 Carat Lab Diamond Rings
A custom-made ring allows you to design your dream piece with personal touches that reflect your story. You control every detail — from diamond shape to band design — within your chosen budget.
Our services include:
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Loose diamond sourcing to fit your preference.
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CAD creations for visual design previews.
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Bespoke settings handcrafted by expert artisans.
Start your journey with our Custom Jewelry team and create your one-of-a-kind 1.5 carat diamond ring that perfectly captures your style.
FAQs about 1.5 Carat Diamond Rings
How much does a 1.5 Carat diamond ring cost?
$2,000–$2,500 USD (£1,640 – £2,050 GBP) for colourless, VS–VVS lab-grown stones.
How big is a 1.5 Carat diamond in mm?
Around 7.4 mm for round brilliant cuts.
Is a 1.5 Carat diamond ring a good engagement size?
Yes, it’s considered a luxurious yet wearable choice for everyday use.
Are 1.5 Carat lab-grown diamonds cheaper than mined ones?
Absolutely — they’re 40–60% more affordable with identical composition.
What settings make a 1.5 Carat diamond look bigger?
Halo and oval or pear cuts enhance visual spread without increasing carat.
Conclusion
A 1.5 carat lab-grown diamond ring offers the best of both worlds — striking brilliance and graceful presence at an attainable price. It stands out beautifully on the hand while remaining elegant enough for daily wear. For couples seeking refined luxury without overspending, this carat weight is the perfect choice.
Now, it’s your turn to find the one that tells your story. Discover our curated collection of 1.5 Carat Diamond Rings and choose the piece that celebrates your love. Shop Now →
Contact us on WhatsApp at +91 8200212331 - click to chat for (instant reply) or email hello@gilibili.com (reply within 2 days) for assistance or a personalised quote. Whether you’re after a bespoke design, a loose diamond, or your dream engagement ring — we make it happen.