1.5 Carat Diamond (1.50ct)
Our Collection
Browse Our 1.5 Carat Diamonds
Hand-picked certified 1.5 carat diamonds from our current stock — at prices up to 75% below retail.
Size guide
How Big Is a 1.5 Carat Diamond?
A well-cut 1.50 carat round brilliant diamond measures approximately 7.4mm in diameter — about 14% larger than a 1 carat diamond (6.5mm). This size increase is clearly visible on the finger, making 1.5 carats a popular choice for those who want more presence without the price jump to 2 carats.
It's important to understand that carat measures weight, not physical size. A deeply-cut 1.50ct diamond can appear smaller than a well-proportioned one, because more weight is hidden in the pavilion (bottom) of the stone. This is why cut quality matters more than raw carat weight when it comes to visual impact.
* Measurements refer to round brilliant cut diamonds with ideal proportions. Accuracy depends on your screen's pixel density — use the ruler to verify.
A 1.50ct diamond is 50% heavier than a 1.00ct, but only about 14% larger in diameter (7.4mm vs 6.5mm). However, that 14% creates a meaningfully larger face-up area — roughly 30% more — which is why 1.5 carat diamonds look substantially more impressive than 1 carat stones in person.
Pricing
What Does a 1.50ct Diamond Cost?
| Colour | Clarity | Cut | Diamantwerp | Typical Retail |
|---|---|---|---|---|
| D | VVS1 | Excellent | €18,000 | €52,000 |
| F | VS1 | Excellent | €11,000 | €32,000 |
| G | VS2 | Excellent | €8,500 | €24,000 |
| H | SI1 | Very Good | €5,500 | €16,000 |
| I | SI1 | Very Good | €3,500 | €10,000 |
The highlighted row (G / VS2 / Excellent) represents the sweet spot for a 1.5 carat diamond. At this grade, the diamond faces up white and clean, inclusions are invisible without magnification, and the excellent cut ensures maximum sparkle. This combination delivers the best balance of beauty and value at this carat weight.
Prices are indicative and updated regularly. See our full diamond price guide →
Expert pick
Best Value: Our Recommendation
Our diamond experts have seen thousands of 1.5 carat stones come through Antwerp. Here's the combination that consistently delivers the best balance of beauty, sparkle, and value:
The Diamantwerp Sweet Spot
At 1.5 carats, you're in a unique sweet spot in the market. The diamond is large enough to make a real impression, but the price hasn't yet hit the steep premium of 2 carats. We recommend prioritising cut quality above all else — an Excellent cut at 1.50ct creates a diamond that punches well above its weight visually. Stick with G–H colour and VS2 clarity for the best value.
Prioritize Cut
An Excellent cut at 1.5 carats creates exceptional brilliance and makes the diamond appear even larger. The visual difference between Excellent and Very Good is clearly noticeable at this size.
Save on Colour
G–H colour delivers a bright, white appearance at 1.50ct. You'd need a trained eye and a side-by-side comparison to distinguish it from D–E colour — and the savings are substantial.
Eye-Clean Clarity
VS2 is the sweet spot for 1.5 carats — reliably eye-clean with no visible inclusions. SI1 can also work, but we recommend having each stone individually verified at this size.
Shape Guide
Best Shapes for a 1.5 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 1.50ct, an oval or pear shape can appear equivalent to a 2 carat round — their elongated profile covers significantly more finger area while costing 15–20% less. If classic brilliance is your priority, the round brilliant remains the gold standard for light performance at this substantial size.
Explore all shapes: Diamond Shapes Overview →
Expert Advice
Buying Tips for 1.5 Carat Diamonds
The 1.5 carat sweet spot. 1.5 carats sits between two major price benchmarks (1.00 and 2.00). This means you get significantly more diamond than 1 carat without the steep premium that kicks in at 2 carats. It's one of the smartest choices in the diamond market for maximising visual impact per euro.
Look at 1.40–1.49ct diamonds. Just like the 1 and 2 carat marks, the 1.50ct benchmark carries a small price premium. A 1.45ct diamond looks identical to 1.50ct on the finger but can save you €500–€1,000. This is a proven strategy that experienced buyers consistently use.
Never compromise on cut. At 1.5 carats, the difference between an Excellent and Very Good cut becomes clearly visible. A well-cut 1.50ct diamond will outperform a poorly cut 2.00ct stone — it will appear brighter, more alive, and can even look similar in size. Invest in the best cut grade your budget allows.
Always insist on certification. Every diamond at Diamantwerp comes with an independent grading report from GIA, HRD Antwerp, or IGI. At the 1.5 carat price point, certification protects your investment and gives you complete transparency about what you're buying.
Consider fluorescence. A diamond with faint to medium blue fluorescence can appear slightly whiter in natural light, especially in G–I colour grades. At 1.5 carats, this can save you €500–€1,500 without any visible downside. Our experts can help you identify stones where fluorescence is a positive trait.
Buy from the source. At 1.5 carats, the savings from buying directly in Antwerp's diamond district become substantial — we're talking thousands of euros compared to high-street retailers. Antwerp handles over 80% of the world's rough diamond trade. 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 1.5 carat diamond cost?
A 1.5 carat (1.50ct) diamond at Diamantwerp costs between €3,500 and €22,000, depending on the combination of cut quality, colour grade, and clarity. The most popular combination — G colour, VS2 clarity, Excellent cut — averages around €8,500. 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 1.5 carat diamond?
A well-cut 1.50 carat round brilliant diamond measures approximately 7.4mm in diameter — about 14% larger than a 1 carat diamond (6.5mm). The exact dimensions vary depending on the diamond's shape and cut proportions. This creates a noticeably more impressive presence on the finger while remaining more accessible than a 2 carat stone.
Is 1.5 carats a good size for an engagement ring?
1.5 carats is an excellent choice for an engagement ring. It offers significantly more visual impact than a 1 carat diamond, stands out beautifully on the finger, and represents outstanding value. You get a noticeably larger diamond without the steep price jump that comes at the 2 carat mark. With the right cut quality, a 1.5ct stone is truly impressive.
What is the best colour and clarity for a 1.5 carat diamond?
For a 1.50ct diamond, we recommend G–H colour and VS2 clarity. At this size, the sweet spot is similar to a 1 carat — VS2 remains reliably eye-clean, and G–H colour faces up bright and white. SI1 can also work but we recommend individual verification at this size. Prioritise cut quality — it has the greatest impact on sparkle.
Are Diamantwerp's 1.5 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. This gives you complete confidence in what you're purchasing.
