Diamond Price Per Carat Index — 2026
How much does a diamond cost per carat in 2026? A 1-carat round brilliant GIA-certified natural diamond averages $5,500–$9,500 per carat at retail in 2026; the identical carat weight in an IGI lab-grown stone trades at $390–$780 per carat after another quarter of lab-grown price compression. Fancy shapes (oval, emerald, pear, cushion) run 15–30% cheaper than round at the same spec, and the per-carat rate jumps at the 1.00, 1.50, and 2.00 ct thresholds.
Diamond price per carat in 2026 — by shape, carat weight, and grading lab
Every row is a per-carat rate, not a total. Multiply by the actual carat weight to get the total price. Bands cover G–J color, VS–SI clarity, strong cut, on a major-lab report. D–F / VVS goods sit above the top of each band; J / SI2 sit at or below the bottom. Fluorescence, exact proportions, and lab choice can push an individual stone outside the band in either direction.
Round brilliant is the reference shape. Fancy shapes (oval, emerald, pear, cushion, radiant, marquise) typically run 15–30% cheaper per carat at the same spec because they retain more weight from the rough. Lab-grown is on a separate, far flatter curve — the natural-only "magic weight" premium at 1.00 / 1.50 / 2.00 ct is muted on lab-grown because there is no rough-rarity scarcity.
Natural vs. lab-grown — round brilliant and fancy shapes
Read across, then multiply by carat weight. Natural columns assume GIA or AGS; lab-grown columns assume IGI or GIA. A stone without a major-lab report does not belong on this chart at any price.
| Carat weight | Natural round GIA / AGS · per ct | Natural fancy GIA / AGS · per ct | Lab round IGI / GIA · per ct | Lab fancy IGI / GIA · per ct |
|---|---|---|---|---|
| 0.50 ct | $2,000–$4,500 | $1,600–$3,600 | $225–$450 | $180–$360 |
| 0.90–0.99 ct | $4,200–$7,500 | $3,400–$6,000 | $310–$625 | $250–$500 |
| 1.00 ct | $5,500–$9,500 | $4,400–$7,500 | $390–$780 | $315–$625 |
| 1.50 ct | $7,800–$13,500 | $6,200–$10,800 | $470–$950 | $375–$760 |
| 2.00 ct | $11,000–$18,000 | $8,500–$14,500 | $600–$1,200 | $480–$960 |
| 3.00 ct | $17,500–$30,000+ | $13,500–$24,000 | $780–$1,575 | $625–$1,255 |
Diamond price by exact carat weight
The four sections below break out the four highest-volume carat-weight queries — 1 ct, 2 ct, 5 ct, and 10 ct — by clarity range, color range, and grading lab. Same per-carat rates as the master table above, segmented at the granularity buyers actually shop.
1 ct diamond price per carat (2026): $5,500–$9,500 GIA natural
A 1-carat round brilliant natural diamond costs $5,500–$9,500 per carat at retail in Q2 2026 for G–J color, VS–SI clarity on a GIA report — about $5,500–$9,500 total at that grade. The same carat weight in an IGI-graded lab-grown stone trades at $390–$780 per carat. Fancy shapes run 15–30% cheaper at the same spec.
Approximate total-stone range at 1 ct: $5,500–$15,500 total (natural), $315–$780 total (lab-grown).
| Stone type | Clarity range | Color range | Source lab | Price per carat (USD) |
|---|---|---|---|---|
| Natural | VS1–SI1 (eye-clean) | G–J (near-colorless) | GIA / AGS | $5,500–$9,500/ct |
| Natural | VVS2–IF | D–F (colorless) | GIA / AGS | $9,000–$15,500/ct |
| Lab-grown | VS1–SI1 (eye-clean) | G–J (near-colorless) | IGI / GIA | $390–$780/ct |
1 ct diamond pricing — common questions
- What's the best color and clarity for a 1-carat diamond?
- At 1 carat, G–H color with VS2–SI1 clarity in a strong cut faces up indistinguishable from D color, IF clarity — and costs 30–50% less. Spending on cut over color and clarity is the highest-ROI lever at this size. Avoid SI2 unless you have inspected the inclusion map on the GIA report.
- Does the grading lab (GIA vs IGI) matter for a 1-carat diamond?
- For 1-carat natural diamonds, use GIA or AGS only — IGI runs roughly 5–10% looser on color and clarity at this tier, which translates directly into resale risk. For 1-carat lab-grown, IGI is the de facto standard and the market prices accordingly. GIA-graded lab-grown carries a small premium but is more liquid at resale.
- How much cheaper is a 1-carat lab-grown diamond vs natural?
- A 1-carat IGI lab-grown round trades at $390–$780 per carat in 2026, versus $5,500–$9,500 per carat for a GIA-graded natural at the same eye-clean spec. That is roughly 14× cheaper — about $5,000–$8,500 saved on a visually identical stone. The trade-off is resale: lab-grown prices continue to compress year over year.
- What does 'average 1-carat diamond price' actually mean?
- There is no single average. A GIA-graded 1-carat round spreads $5,500–$15,500 per carat depending on color (G–J near-colorless vs D–F colorless) and clarity (SI1 eye-clean vs VVS2). Any average price quoted without the underlying spec range is marketing, not market data.
- Is buying just under 1 carat (0.90–0.99 ct) actually cheaper?
- Yes — 15–25% per carat cheaper on natural, for a near-identical face-up size. A 0.95 ct round measures about 6.3 mm versus 6.5 mm for a 1.00 ct, a sub-millimeter gap invisible across a table. The premium at the 1.00 ct threshold is a magic-weight tax, not a beauty difference. On lab-grown the dip is muted.
2 ct diamond price per carat (2026): $11,000–$18,000 GIA natural
A 2-carat round brilliant natural diamond costs $11,000–$18,000 per carat at retail in Q2 2026 for G–J color, VS–SI clarity on a GIA report — about $22,000–$36,000 total. The same carat weight in an IGI-graded lab-grown stone trades at $600–$1,200 per carat, or roughly $1,200–$2,400 total at the same eye-clean spec.
Approximate total-stone range at 2 ct: $22,000–$61,000 total (natural), $1,200–$2,400 total (lab-grown).
| Stone type | Clarity range | Color range | Source lab | Price per carat (USD) |
|---|---|---|---|---|
| Natural | VS1–SI1 (eye-clean) | G–J (near-colorless) | GIA / AGS | $11,000–$18,000/ct |
| Natural | VVS2–IF | D–F (colorless) | GIA / AGS | $17,000–$30,500/ct |
| Lab-grown | VS1–SI1 (eye-clean) | G–J (near-colorless) | IGI / GIA | $600–$1,200/ct |
2 ct diamond pricing — common questions
- What's the best color and clarity trade-off at 2 carats?
- At 2 ct, color matters more than at 1 ct because the larger table area shows tint more readily. H–I color with VS2–SI1 clarity still faces up clean in a strong cut and saves 25–40% over D–F VVS. Below J color, warmth becomes visible and resale narrows. Always inspect the stone face-up under daylight, not just under jeweler lighting.
- Does GIA vs IGI matter for a 2-carat diamond?
- More than at 1 ct. The grading drift between IGI and GIA on natural 2-carat goods is financially material — 15–25% on otherwise identical stones. For natural 2 ct, use GIA or AGS only. For lab-grown 2 ct, IGI is the market standard; a GIA-graded lab-grown carries a small premium but is more liquid at resale.
- How much cheaper is a 2-carat lab-grown vs natural diamond?
- A 2-carat IGI lab-grown round trades at $600–$1,200 per carat in 2026, versus $11,000–$18,000 per carat for a GIA-graded natural at eye-clean spec. That is roughly 18× cheaper — about $20,000–$33,000 in total savings on a visually identical stone. Lab-grown resale value continues to compress year over year.
- Why is the per-carat rate so much higher at 2 carats than at 1 carat?
- Rough scarcity. A 1-ct polished diamond comes from larger, more available rough than a 2-ct polished. The per-carat rate steps up roughly 40% between 1.90 ct and 2.00 ct on natural — a 1.99 ct stone can sit at $9,000 per carat while a 2.00 ct twin of identical spec sits at $13,000 per carat. On lab-grown this jump is muted.
- What is the 'average price' for a 2-carat diamond?
- There is no reliable single average. A 2-carat GIA-graded round spreads $22,000–$61,000 total depending on clarity range (VS–SI eye-clean vs VVS–IF) and color range (G–J vs D–F). Average figures hide a 3× variance and should not be used for budgeting. Specify the exact clarity and color band before believing a quoted price.
5 ct diamond price per carat (2026): $25,000–$60,000 GIA natural
A 5-carat round brilliant natural diamond costs $25,000–$60,000 per carat at retail in Q2 2026 for G–J color, VS–SI clarity on a GIA report — about $125,000–$300,000 total, with the top of the band lifted by public auction comparables. The same carat weight in an IGI-graded lab-grown stone trades at $850–$2,150 per carat.
Approximate total-stone range at 5 ct: $125,000–$625,000 total (natural), $4,250–$10,750 total (lab-grown).
| Stone type | Clarity range | Color range | Source lab | Price per carat (USD) |
|---|---|---|---|---|
| Natural | VS1–SI1 (eye-clean) | G–J (near-colorless) | GIA / AGS | $25,000–$60,000/ct |
| Natural | VVS2–IF | D–F (colorless) | GIA / AGS | $55,000–$125,000/ct |
| Lab-grown | VS1–SI1 (eye-clean) | G–J (near-colorless) | IGI / GIA | $850–$2,150/ct |
5 ct diamond pricing — common questions
- Why is the price range so wide for a 5-carat diamond?
- Retail visibility thins above 3 ct. A 5-ct GIA G–J VS–SI round trades at $25,000–$60,000 per carat in 2026, while D–F VVS–IF reaches $55,000–$125,000 per carat. Public auction comparables (Sotheby’s, Christie’s) drive the top of the band — most 5-ct naturals trade by private treaty or at auction, not in retail showcases, so any single "average" hides a 4× variance.
- Does GIA vs IGI matter at 5 carats?
- Critical. For 5-ct natural, only GIA or AGS reports are taken seriously — IGI-graded naturals at this tier trade at a 15–25% discount because the grading drift compounds at the per-carat dollar value. Do not buy a natural 5 ct on an IGI report unless the discount is fully reflected. For 5-ct lab-grown, IGI remains the market standard.
- How much cheaper is a 5-carat lab-grown vs natural diamond?
- A 5-carat IGI lab-grown round trades at $850–$2,150 per carat in 2026, versus $25,000–$60,000 per carat for a GIA-graded natural at eye-clean spec. That is roughly 29× cheaper — about $120,000–$295,000 in total savings on a visually identical stone. Reactor capacity for large rough lifts the per-carat rate roughly 2× over 1 ct lab-grown.
- What does 'average price' mean for a 5-carat diamond?
- Very little. A 5-carat natural spreads $125,000–$625,000 total depending on color, clarity, cut quality, and source lab — a 5× variance. Any single average figure is a vendor marketing tool, not market data. Specify the exact GIA color and clarity combination before believing a quoted price, and request the actual report number.
- Why are 5-carat lab-grown prices higher per carat than 1-carat lab-grown?
- Reactor capacity for large rough is finite. Even lab-grown diamonds carry a mild scarcity premium above 3 carats — a 5-carat lab-grown round at $850–$2,150 per carat sits roughly 2× the per-carat rate of a 1-carat lab-grown. The premium narrows year over year as growers scale capacity, so expect this gap to compress.
10 ct diamond price per carat (2026): $60,000–$150,000 GIA natural
A 10-carat round brilliant natural diamond costs $60,000–$150,000 per carat at retail in Q2 2026 for G–J color, VS–SI clarity on a GIA report — about $600,000–$1,500,000 total, with VVS–IF colorless stones reaching auction-tier multiples above that. The same carat weight in an IGI-graded lab-grown stone trades at $1,275–$3,000 per carat.
Approximate total-stone range at 10 ct: $600,000–$5,000,000+ total (natural), $12,750–$30,000 total (lab-grown).
| Stone type | Clarity range | Color range | Source lab | Price per carat (USD) |
|---|---|---|---|---|
| Natural | VS1–SI1 (eye-clean) | G–J (near-colorless) | GIA / AGS | $60,000–$150,000/ct |
| Natural | VVS2–IF | D–F (colorless) | GIA / AGS | $150,000–$500,000/ct |
| Lab-grown | VS1–SI1 (eye-clean) | G–J (near-colorless) | IGI / GIA | $1,275–$3,000/ct |
10 ct diamond pricing — common questions
- What drives 10-carat diamond pricing?
- Rarity. A 10-ct GIA G–J VS–SI round trades at $60,000–$150,000 per carat in 2026, while D–F VVS–IF reaches auction-tier multiples above $500,000 per carat. Below the J / SI threshold, demand collapses — 10-carat goods are bought for trophy value and resale, both of which require top-grade specs. Provenance and fluorescence also move price materially at this tier.
- Does GIA matter at 10 carats?
- It is an absolute requirement. No 10-carat natural diamond sells through a credible channel without a GIA report. AGS reports are accepted but less liquid at resale; IGI is effectively not used in this tier for naturals. For 10-ct lab-grown, IGI remains the market standard, though a GIA-graded lab-grown carries a small premium.
- How much cheaper is a 10-carat lab-grown vs natural diamond?
- A 10-carat IGI lab-grown round trades at $1,275–$3,000 per carat in 2026, versus $60,000–$150,000 per carat for a GIA-graded natural. That is roughly 50× cheaper — about $600,000 to $1.5 million in total savings on a visually identical stone. The lab-grown 10-ct market is thin; most sales are bespoke order against a brief rather than stock.
- What is the 'average price' for a 10-carat diamond?
- There is no average; every 10-carat natural is bespoke. Total prices span $600,000 to $5 million-plus depending on color, clarity, fluorescence, fancy color presence, cut quality, and provenance. Average figures at this tier are meaningless — pricing happens stone by stone, almost always against a private brief rather than a published price list.
- Where do 10-carat natural diamonds actually trade?
- Almost exclusively private treaty or major auction (Sotheby’s, Christie’s, Bonhams). Retail showcase transactions at 10 carats are unusual; most stones are sourced on commission against a buyer brief. Liquidity at this tier is thin, slow, and discreet — expect a 6–18 month search window for a specific grade combination.
Where the threshold jumps land
On natural goods, the per-carat rate steps up at 1.00 ct, 1.50 ct, and 2.00 ct. The 2.00 ct mark is the steepest in percentage terms — a 1.90 ct stone can sit 30–50% under a 2.00 ct twin in per-carat rate, layered on top of the weight difference. A 0.95–0.99 ct round faces the eye as a one-carat and saves 15–25% per carat versus a true 1.00 ct of identical spec.
On lab-grown, these dips are mostly cosmetic. There is no rough-rarity reason for a 2 ct lab stone to cost categorically more per carat than a 1 ct lab stone, and the market has priced that in. Shopping just-under-threshold on lab-grown is not the leverage move it is on natural.
What this index is — and what it is not
Bands are derived from trade-desk visibility into wholesale benchmarks (Rapaport list is quoted off and discounted from at the wholesale tier — typically 20–40% below list), the IDEX Online Polished Diamond Price Index for directional movement, and public auction comparables for the top of the natural curve. We do not reproduce the Rapaport sheet, and we do not publish single-point prices for specific specs because diamond pricing is a range business and any precise figure for "a 1 ct G VS1" is selling, not informing.
Lab-grown bands reflect the continuing year-over-year price compression in the segment. A lab stone purchased at the top of its band in 2026 will, on current trajectory, be worth less than the bottom of the same band in 2028. If a stable store of value matters, this is not your buy.
Use this index alongside
- The full diamond price per carat 2026 guide — the narrative behind these bands, with the threshold-jump math worked out.
- Lab-grown price per carat by clarity — how the lab-grown curve moves across VS, VVS, and flawless.
- How to negotiate a diamond price — converting these bands into a counter at the desk.
- Lab-grown vs. natural — the economics — why the two columns above sit an order of magnitude apart.
- How to read a GIA diamond report — what the report has to say before the price band applies to your stone.
Methodology and refresh cadence
This index is refreshed on a rolling basis as wholesale benchmarks move and as our trade-desk visibility on completed deals updates. The "last updated" stamp at the top of the page reflects the most recent band review. Bands move in increments — a 5–10% shift in either direction within a quarter is normal; a full reshuffle is not.
If you spot a band that no longer matches what your jeweler is quoting in either direction, that is useful signal. Email the desk and we will pressure-test it against our sources before the next refresh.