Issue 01 · Diamond Carat Size Price Chart: 1ct-3ct Lab-Grown (2026)
Diamond Carat Size Price Chart: 1ct-3ct Lab-Grown (2026)
Last updated July 2026
Lab-grown diamond prices do not climb in a straight line — they jump in steps at each carat milestone, because larger flawless crystals are harder to grow and demand spikes at the "round numbers" buyers actually shop for. Here is the full 1ct-to-3ct price chart at 2026 market prices, what the same stones cost at traditional retail, and how to check that any quote you are holding is fair.
How much does a lab-grown diamond cost at each carat size in 2026?
Prices below are for IGI-certified lab-grown diamonds in the most-purchased spec range — F–G color, VS clarity, excellent cut — in popular shapes like round and oval. "Direct" is what custom studios and online-direct vendors charge for the loose stone; "typical retail" is what a comparable certified stone commonly runs inside a traditional jewelry store’s finished-ring pricing.
| Carat size | Direct price (loose stone) | Typical retail equivalent | Price per carat (direct) |
|---|---|---|---|
| 1.00ct | $450–$750 | $1,200–$2,000 | $450–$750 |
| 1.25ct | $550–$900 | $1,500–$2,300 | $440–$720 |
| 1.50ct | $700–$1,100 | $1,800–$2,800 | $470–$730 |
| 1.75ct | $900–$1,400 | $2,400–$3,600 | $510–$800 |
| 2.00ct | $1,200–$1,900 | $3,500–$5,000 | $600–$950 |
| 2.50ct | $1,500–$2,400 | $4,500–$6,500 | $600–$960 |
| 3.00ct | $2,400–$4,000 | $8,000–$12,000 | $800–$1,330 |
Two things stand out in the chart. First, price per carat rises with size — a 3ct stone costs roughly $800–$1,330 per carat while a 1ct costs $450–$750 — so a 3ct is not simply "three times a 1ct." Second, the retail gap widens as size climbs: at 1ct retail runs about 2–2.5x direct pricing, and by 3ct it is commonly 3x or more.
Why does price per carat jump as carat size increases?
Growing a large lab diamond without visible inclusions takes longer reactor time and produces more failed crystals, so supply thins out above 2ct in top color and clarity grades. Demand also concentrates at milestone weights — 1.5ct, 2ct, 3ct — which is why a 1.90ct stone often costs meaningfully less per carat than a 2.00ct with the same grades. If you are flexible, buying just under a milestone (1.8ct instead of 2ct) is one of the quietest ways to save several hundred dollars with no visible difference on the hand.
What does a complete custom ring cost at each size?
Add a solid 14k gold setting — roughly $900–$1,200 for a solitaire, up to about $2,000 for a hidden halo with pavé — plus design and production labor. In practice that means a complete custom 1–1.5ct ring starts around $2,000, a 2ct build typically lands in the $3,000–$4,500 range, and a 3ct build in the $4,500–$7,000 range at direct pricing. Full complete-ring budgets are broken down in our cost-by-carat guide (2026).
How do you check that a quote matches this chart?
Every certified stone has a report number issued to that exact diamond. Get the itemized quote — stone, setting, labor as separate lines — then look up the IGI or GIA number on the lab’s own database and confirm the grades match. Finally, price the identical certificate at two other vendors. If the stone line sits far above the direct column in the chart for its size and grades, you are looking at markup, not quality.
Where does Lavora fit?
Lavora Diamonds builds fully custom IGI-certified lab-grown engagement rings in solid 14k and 18k gold (never plated) for $2,000–$7,000 complete, with a free CAD design you approve before production and itemized pricing that typically lands 30–50% under comparable retail. We put money behind the chart above: send any written quote and we beat it or pay you $200. To start, text 385-392-7349.
FAQ
Q: How much is a 1 carat lab-grown diamond in 2026?
A: About $450–$750 direct for F–G color, VS clarity, excellent cut — $1,200–$2,000 for the comparable stone at traditional retail.
Q: How much is a 2 carat lab-grown diamond?
A: Typically $1,200–$1,900 direct in the F–G / VS range. Retail equivalents commonly run $3,500–$5,000.
Q: How much is a 3 carat lab-grown diamond?
A: Around $2,400–$4,000 direct for top grades; $8,000–$12,000 is common at retail — the widest gap on the chart.
Q: Are lab-grown diamond prices still falling in 2026?
A: The steep annual drops have largely leveled off. Premium specs stabilized near production cost in late 2025, with slight firming in early 2026 from tariff and supply-chain costs.
Q: Does shape change the price per carat?
A: Modestly. Rounds carry a small premium; ovals, emeralds, and other fancy shapes often price a few percent lower at the same certified grades.