3 Carat Diamond (3.00ct)
Our Collection
Browse Our 3 Carat Diamonds
Hand-picked certified 3 carat diamonds from our current stock — at prices up to 75% below retail.
Size guide
How Big Is a 3 Carat Diamond?
A well-cut 3.00 carat round brilliant diamond measures approximately 9.7mm in diameter — nearly a full centimetre across. At this size, the diamond dominates the finger and creates an unmistakable visual impact that's visible from across the room.
It's important to understand that carat measures weight, not physical size. A deeply-cut 3.00ct diamond can appear smaller than a well-proportioned one, because more weight is hidden in the pavilion (bottom) of the stone. At the 3 carat price point, cut quality is absolutely critical — it determines whether your diamond looks like the exceptional stone it should be.
* Measurements refer to round brilliant cut diamonds with ideal proportions. Accuracy depends on your screen's pixel density — use the ruler to verify.
A 3.00ct diamond is three times the weight of a 1.00ct, but about 49% larger in diameter (9.7mm vs 6.5mm). While weight triples, the visible face-up area increases by roughly 120% — creating a dramatically more impressive presence. This exponential relationship between weight and visual size is why 3 carat diamonds are so highly prized and rare.
Pricing
What Does a 3.00ct Diamond Cost?
| Colour | Clarity | Cut | Diamantwerp | Typical Retail |
|---|---|---|---|---|
| D | VVS1 | Excellent | €75,000 | €220,000 |
| F | VS1 | Excellent | €45,000 | €130,000 |
| G | VS2 | Excellent | €30,000 | €85,000 |
| H | SI1 | Very Good | €18,000 | €52,000 |
| I | SI1 | Very Good | €15,000 | €42,000 |
The highlighted row (G / VS2 / Excellent) represents the sweet spot for a 3 carat diamond. At this grade, the diamond faces up white and clean, with inclusions invisible to the naked eye and an excellent cut that maximises the stone's extraordinary potential. At Diamantwerp, this combination is available at a fraction of traditional retail pricing.
Prices are indicative and updated regularly. See our full diamond price guide →
Expert pick
Best Value: Our Recommendation
Our diamond experts have seen some exceptional 3 carat stones come through Antwerp. Here's the combination that consistently delivers the best balance of beauty, rarity, and value at this prestigious carat weight:
The Diamantwerp Sweet Spot
At 3 carats, you're in rare territory — and every detail matters. We recommend E–G colour and VVS2–VS1 clarity, stepping up further than for 2 carat stones. The larger surface area makes any colour tint or inclusion more perceptible. And the single most important factor? An Excellent cut is absolutely non-negotiable. At this price point, a poorly cut diamond is an expensive mistake.
Prioritize Cut
At 3 carats, Excellent cut is non-negotiable. A poor cut wastes the extraordinary potential of a stone this rare — and at this price, that's unacceptable.
Step up on Colour
We recommend E–G colour for 3ct. The larger face-up area makes even subtle warmth more visible. The difference between G and H is worth the investment at this level.
VVS2–VS1 Clarity
At 3 carats, clarity matters more. VS2 may still be eye-clean, but VVS2–VS1 gives you certainty and protects the diamond's investment value.
Shape Guide
Best Shapes for a 3 Carat Diamond
The shape of your diamond affects how large it appears face-up. At 3 carats, the visual differences between shapes become truly dramatic — elongated shapes like oval and pear can appear equivalent to a 4 carat round.
At 3.00ct, an oval or pear shape creates a truly extraordinary visual — their elongated profiles can appear equivalent to a 4 carat round while costing significantly less. A 3 carat round brilliant remains the ultimate expression of classic diamond beauty, with unmatched light performance at this magnificent size.
Explore all shapes: Diamond Shapes Overview →
Expert Advice
Buying Tips for 3 Carat Diamonds
Always buy GIA Excellent cut — no exceptions. At the 3 carat price point, cut quality is the single most consequential decision you'll make. An Excellent cut 3 carat diamond will outperform and outshine a poorly cut 4 carat diamond. The visual difference at this size is dramatic and immediately apparent.
Consider a 2.80–2.99ct diamond. The 3 carat mark carries a substantial price premium. A 2.90ct diamond is virtually indistinguishable from 3.00ct on the finger, but can save you €3,000–€5,000 or more. At this investment level, that's meaningful savings you can redirect toward a higher colour or clarity grade.
Invest in higher colour and clarity grades. At 3 carats, the diamond's surface area is large enough that colour warmth and clarity characteristics become more visible to the naked eye. We recommend E–G colour and VVS2–VS1 clarity — the incremental cost is small relative to the total investment, and it ensures your diamond performs beautifully.
Certification is non-negotiable. Every diamond at Diamantwerp comes with an independent grading report from GIA, HRD Antwerp, or IGI. At this price level, buying an uncertified diamond is an unacceptable risk. The certificate is your guarantee of quality and your protection for the investment.
Think about investment value. 3 carat diamonds in high grades have historically appreciated in value. Their rarity — natural diamonds of this size and quality are genuinely scarce — means demand consistently outpaces supply. A well-chosen 3ct diamond is both a stunning piece of jewellery and a sound store of value.
Buy from the source to save thousands. At 3 carats, the retail markup can be enormous — we're talking €30,000–€100,000+ in middlemen fees. Antwerp handles over 80% of the world's rough diamond trade. By buying directly from the diamond district, you access the same stones at wholesale pricing. Learn about our heritage →
Explore more
Other Carat Weights
Compare sizes and prices across our most popular carat weights
FAQ
Frequently Asked Questions
How much does a 3 carat diamond cost?
A 3 carat (3.00ct) diamond at Diamantwerp costs between €15,000 and €85,000, depending on the combination of cut quality, colour grade, and clarity. The most popular combination — G colour, VS2 clarity, Excellent cut — averages around €30,000. That's up to 70% less than you'd pay at a typical high-street jeweller for the same certified stone.
How big is a 3 carat diamond?
A well-cut 3.00 carat round brilliant diamond measures approximately 9.7mm in diameter — significantly larger than a 2 carat (8.2mm) and nearly double the visual presence of a 1 carat (6.5mm). The exact dimensions vary depending on the diamond's shape and cut proportions. At this size, the diamond is an unmistakable statement piece.
Is a 3 carat diamond worth the investment?
3 carat diamonds in high grades (D–G colour, VS1 or better, Excellent cut) are among the best diamond investments. Their rarity ensures strong value retention, and demand consistently outpaces supply. A well-chosen 3 carat diamond from a reputable source like Antwerp is both a stunning piece of jewellery and a sound store of value. With the right certification, your investment is fully documented and transparent.
What is the best colour and clarity for a 3 carat diamond?
For a 3.00ct diamond, we recommend E–G colour and VVS2–VS1 clarity. At this exceptional size, even subtle colour tints and inclusions become more perceptible to the naked eye. Higher grades ensure the diamond's beauty matches its impressive presence. An Excellent cut is absolutely essential — it has the greatest impact on sparkle and visual impact.
Are Diamantwerp's 3 carat diamonds certified?
Yes. Every diamond we sell comes with an independent grading report from GIA, HRD Antwerp, or IGI — the world's three most respected diamond laboratories. Each certificate details the exact 4C grades, measurements, proportions, and any laser inscription. At the 3 carat price level, certification is non-negotiable — it protects your investment and guarantees complete transparency.
