Lab Grown Diamonds
Lab Grown Diamonds are real diamonds: the same hardness, the same light, and graded by the same independent labs. Every stone here ships with its own report, at a fraction of the price of a comparable mined stone.
What a loose lab grown diamond costs today
Live prices from our own inventory, not an estimate. Every stone is IGI or GIA certified. The second column is what a well specified stone costs: G colour, VS1 clarity, Excellent cut.
| Carat weight | Prices from | G / VS1 / Excellent from |
|---|---|---|
| 1.00 - 1.49 ct | $312 | $393 |
| 1.50 - 1.99 ct | $473 | $514 |
| 2.00 - 2.99 ct | $853 | $1,064 |
| 3.00 - 3.99 ct | $1,210 | $1,489 |
| 4.00 - 4.99 ct | $1,636 | $1,915 |
| 5.00 ct + | $2,202 | $2,406 |
Updated November 9, 2026. Prices move with the market; the search above always shows live availability.
In the vault right now
A sample of our own certified stones, in our New York vault today. The search above has every stone, with photos and the full certificate.
| Shape | Carat | Colour | Clarity | Certificate | Price |
|---|---|---|---|---|---|
| Emerald | 0.98 ct | E | VS1 | IGI 812627214 | $437 |
| Elongated Hexagon | 0.99 ct | E | VS1 | IGI 827611249 | $442 |
| Oval | 1.01 ct | E | VS1 | IGI 826697882 | $451 |
| Princess | 1.02 ct | E | VS1 | IGI 812606481 | $455 |
| Dutch Marquise | 1.08 ct | E | VS2 | IGI 821607840 | $426 |
| Marquise | 1.50 ct | E | VS1 | IGI 839639370 | $718 |
| Cushion | 1.50 ct | E | VS1 | IGI 803689154 | $718 |
| Dutch Marquise | 1.52 ct | E | VS1 | IGI 814627758 | $728 |
| Portuguese | 1.52 ct | E | VS1 | IGI 840645857 | $728 |
| Long Cushion | 2.59 ct | H | VVS2 | IGI 801675188 | $1,036 |
Sampled from live inventory on November 9, 2026. Availability changes daily; the search above is always current.
Signature cuts, produced in house
Most lab grown retailers sell the same shapes from the same suppliers. We cut our own. Six signature cuts are produced in our own workshop: the Dutch Marquise, the Moval, the Portuguese Cut, the Old Mine Cut, the Elongated Hexagon, and the Rose Cut. Each is IGI or GIA certified like every stone on this page, and each has its own collection of live inventory. If you want a diamond most jewelers have never stocked, start with these.
What are lab grown diamonds?
Lab grown diamonds are real diamonds. They are pure crystallized carbon with the same chemical, physical, and optical properties as mined diamonds: the same hardness (10 on the Mohs scale), the same brilliance, the same fire. The only difference is origin: a lab grown diamond is created in a controlled laboratory over a few weeks rather than formed in the earth over billions of years. Since 2018, the U.S. Federal Trade Commission has formally recognized lab grown diamonds as diamonds. To the eye, and to a jeweler's loupe, they are indistinguishable from mined stones; only specialized equipment can tell them apart. Gem quality stones are grown by one of two methods, HPHT or CVD; both produce genuine diamonds, graded on the same 4Cs as mined stones.
Loose diamonds, ready to set
Every stone on this page is sold loose: you buy the exact certified diamond you see, not a lookalike from a stock photo. It ships with its IGI or GIA grading report and matching laser inscription. Keep it loose, or have us set it: pair your stone with any of our engagement ring settings and we hand set and finish the ring in New York. Buying loose also means the full inventory to choose from, over 400,000 certified stones, which is how you find the exact combination of shape, size, and grade you want.
Lab grown vs mined diamonds: cost and value
The headline difference is price. A lab grown diamond typically costs significantly less than a mined diamond of the same size and quality, which means a larger or higher-grade stone for the same budget. Because supply isn't constrained by mining, you also get more consistent availability across shapes and sizes. Lab grown diamonds are valued for their beauty and value-per-carat: the right frame is buying a stone you'll wear and love, not a financial instrument.
How to choose: the 4Cs
- Cut is the most important: it drives how a diamond sparkles. Prioritize it.
- Color runs D (colorless) to Z; D to H reads white in most settings.
- Clarity runs FL (flawless) to I; VS and SI grades are typically "eye-clean," meaning no inclusions visible without magnification.
- Carat is weight, not size: elongated shapes like oval and marquise look larger per carat than rounds.
Use the filters above to balance the 4Cs to your budget; our team can help you narrow it down.
Why buy lab grown diamonds from Stienhardt
Every Stienhardt diamond is independently certified by IGI or GIA, two of the most trusted gemological labs, so you're buying verified quality, not a marketing claim. IGI grades the full 4Cs; as of October 1, 2025, GIA grades lab grown diamonds on descriptive Premium and Standard tiers. All of our diamonds are conflict-free, available loose or set into any of our ring, earring, and pendant styles, and backed by free insured shipping, a lifetime manufacturing warranty, and free 30-day returns. See the stones in person at our showroom at 36 West 44th Street in Manhattan, browse the collection above, or read our diamond education guides to go deeper before you buy.
Lab grown diamonds: frequently asked questions
Are lab grown diamonds real diamonds?
Yes. Lab grown diamonds are pure crystallized carbon, chemically and optically identical to mined diamonds. The FTC has recognized them as real diamonds since 2018.
What is a lab grown diamond?
A diamond created in a controlled lab from a diamond seed, rather than mined from the earth: same material, same properties, made in weeks instead of eons.
How are lab grown diamonds made?
Two methods: HPHT (high pressure, high temperature) and CVD (chemical vapor deposition). Both grow a genuine diamond crystal from a carbon seed.
Are Stienhardt's lab grown diamonds certified?
Yes. Every diamond is independently certified and ships with its grading report. IGI issues the full 4C report (cut, color, clarity, carat); as of October 1, 2025, GIA grades lab grown diamonds on Premium and Standard tiers. You can verify any report number on the issuing lab's website.
Are lab grown diamonds cheaper than mined diamonds?
Typically they cost significantly less for the same size and quality, so you can get a larger or higher-grade stone for the same budget.
Can you tell a lab grown diamond from a mined one?
Not by eye or with a standard loupe; they're identical. Only specialized lab equipment can distinguish them.
Which lab grown diamond shape should I choose?
Choose the shape you want to wear. Elongated shapes like oval, marquise, and the Dutch Marquise look larger per carat face-up, and rounds sparkle most uniformly. Use the filters above to compare shapes at the same carat.
Are lab grown diamonds ethical and conflict-free?
Yes. All Stienhardt diamonds are conflict-free, with no mining footprint.
What shapes do lab grown diamonds come in?
Every shape: round, oval, princess, cushion, emerald, pear, radiant, marquise, and our signature cuts. Filter by shape above.
What are Stienhardt's signature cuts?
Six cuts we produce in our own workshop: the Dutch Marquise, Moval, Portuguese Cut, Old Mine Cut, Elongated Hexagon, and Rose Cut. Each has its own collection, and every stone is IGI or GIA certified.
How do I choose the right carat, color, and clarity?
Prioritize cut, then pick a color in the D to H range and a VS to SI clarity grade (usually eye-clean), and size carat to your budget.
What's the difference between a loose diamond and a preset one?
A loose diamond is the unmounted stone, which you then set into a ring or setting of your choice. A preset piece comes already mounted.
How do I set a loose diamond into a ring?
Choose your stone, then pick a setting and we'll mount it for you. Start from any loose diamond and build it into a ring.
Can I buy just the loose stone?
Yes. Every diamond here is sold loose, and setting it is optional. Many customers buy the stone first and choose a setting later.
What ships with a loose diamond?
The stone, its IGI or GIA grading report, and a laser inscription matching the report number, sent with free insured shipping.
How much does a 1 carat lab grown diamond cost?
Right now 1 carat stones start at $312, and a well specified stone (G color, VS1 clarity, Excellent cut) starts at $393. The price table above shows live starting prices for every size up to 5 carats and beyond.
How should I care for a lab grown diamond?
Clean gently with warm water, mild soap, and a soft brush; store separately to avoid scratching other pieces. Same care as a mined diamond.
Do lab grown diamonds come with a grading report?
Yes. Each comes with its IGI or GIA grading report. IGI documents the full 4Cs; GIA reports lab grown diamonds on Premium and Standard tiers as of October 1, 2025.
What is your return policy?
Free 30-day returns on diamonds and jewelry.