What Is a Lab Grown Diamond? The Complete Guide for US Buyers

Published: July 20, 2026 Reading Time: 12 min Part 8 of the Zalkari Moissanite and Lab Grown Diamond Series

A lab grown diamond is a real diamond pure carbon crystallized in the isometric crystal system under conditions that produce the same atomic structure, the same optical properties, the same hardness of Mohs 10, and the same 4C grading criteria as a natural mined diamond. The only difference between a lab grown diamond and a natural diamond is where the crystallization happened: in a controlled production facility rather than in the earth's mantle over billions of years.

The FTC updated its definition of diamond in 2018, removing the word natural from the definition entirely. A diamond is now officially defined as a mineral consisting essentially of pure carbon crystallized in the isometric system which lab grown diamonds satisfy completely. They are not simulated diamonds, not imitation diamonds, and not cubic zirconia. They are diamonds.

This guide covers everything US buyers need to know about lab grown diamonds in 2026: how they are made, how they compare to natural diamonds, what the price difference is, how grading works, the ethical picture, and whether lab grown is the right choice for a specific purchase.

How Lab Grown Diamonds Are Made

Two production methods create gem-quality lab grown diamonds. Both start with a carbon source and produce genuine diamond crystal. The method affects some characteristics of the finished stone but not its fundamental identity as diamond.

High Pressure High Temperature (HPHT) replicates the conditions under which natural diamonds form in the earth's mantle. A carbon source typically a small diamond seed crystal is placed in a growth chamber with a catalyst metal and subjected to pressures exceeding 1.5 million pounds per square inch and temperatures above 1,400 degrees Celsius. Under these extreme conditions, the carbon atoms crystallize onto the seed in the diamond cubic structure. The process takes days to weeks depending on the target size.

HPHT diamonds often have a slightly different internal growth pattern than CVD diamonds, visible under gemological examination. Some HPHT diamonds show a slight yellow or brown tint due to nitrogen incorporated during growth, though the finest HPHT production achieves colorless grades.

Chemical Vapor Deposition (CVD) builds diamond crystal layer by layer from a carbon-rich gas. A diamond seed is placed in a chamber filled with carbon-containing gases typically methane at reduced pressure. Microwave energy or similar excitation ionizes the gas, causing carbon atoms to deposit on the seed surface in the diamond cubic structure. The process builds the crystal atom by atom, allowing more precise control over the growth conditions. CVD diamonds often achieve very high color grades because the controlled environment minimizes nitrogen incorporation.

Both methods produce genuine diamond with the same crystal structure, hardness, and optical properties as natural diamond. The production method is noted on grading reports from gemological laboratories and is part of the stone's documentation but does not affect its quality or value in a meaningful way for most buyers.

Lab Grown Diamond vs Natural Diamond: Are They the Same?

Chemically and physically, yes. A lab grown diamond and a natural diamond of equivalent cut, color, and clarity are the same material pure carbon in the diamond cubic crystal structure. They have the same hardness of Mohs 10. The same refractive index of 2.42. The same thermal conductivity. The same optical dispersion.

A trained gemologist examining a lab grown diamond and a natural diamond of the same quality cannot distinguish them through visual inspection alone. Advanced spectroscopic equipment the type used in major gemological laboratories can identify growth patterns characteristic of HPHT or CVD production that distinguish lab grown from natural. This equipment is not available outside professional laboratory settings.

Where they genuinely differ is in geological origin, supply chain, and market price. Natural diamonds formed billions of years ago under conditions that cannot be replicated except imperfectly by the production methods above. Lab grown diamonds have a production timeline of days to weeks. This difference in origin is real and carries meaning for some buyers the billions-of-years geological story is part of what natural diamonds represent symbolically. Whether that matters depends on the individual buyer.

For buyers for whom the geological origin is not central to the purchase, lab grown diamonds offer the same material with better ethics, lower price, and a traceable supply chain a compelling alternative to natural diamonds by any practical metric.

Lab Grown Diamond Pricing in 2026

Lab grown diamond prices have dropped significantly over the past several years and continue to decline as production technology improves and supply increases. In 2026, lab grown diamonds typically cost 70 to 80% less than natural diamonds of comparable specifications.

A 1-carat round brilliant lab grown diamond in G color, VS2 clarity: approximately $1,000 to $2,500 depending on cut quality and vendor.

The equivalent natural diamond: $4,000 to $8,000 or more.

A 2-carat lab grown diamond: approximately $3,000 to $6,000. The equivalent natural diamond: $15,000 to $40,000+.

Lab grown diamond prices have been falling faster than natural diamond prices in recent years as production capacity has scaled. A stone purchased today at $1,500 may have a retail equivalent of $800 or $900 in three to five years as the market continues to evolve. This is relevant for buyers who care about resale value, which we cover directly in the next post in this series.

For buyers comparing lab grown diamond to moissanite our complete comparison guide is at Lab Grown Diamonds vs Moissanite: Which Should You Choose? the key distinction is price and optical character. Moissanite is significantly less expensive than lab grown diamond and produces more fire. Lab grown diamond has diamond's specific optical signature and cultural identity.

The 4Cs for Lab Grown Diamonds

Lab grown diamonds are graded using the same 4C system cut, color, clarity, and carat weight that applies to natural diamonds. GIA, IGI, and other major gemological laboratories issue grading reports for lab grown diamonds using the same criteria as natural diamond reports.

Cut: the most important of the 4Cs for brilliance. A well-cut lab grown diamond of lower color and clarity grades can be more beautiful than a poorly cut stone of higher grades. Excellent and Very Good cut grades from GIA or IGI are the right targets for maximum light performance.

Color: the D-to-Z scale applies. D through F is colorless. G through J is near-colorless very slightly warm but essentially invisible to the naked eye. K and below shows more apparent warmth. For most buyers, G through I color delivers excellent value without visible color difference in most settings.

Clarity: the FL-to-I3 scale applies. VS2 and SI1 are the sweet spots for value eye-clean grades where inclusions are not visible to the naked eye at normal viewing distance. Flawless and internally flawless grades command significant premiums and the clarity advantage is only visible under 10x magnification.

Carat weight: same measurement as natural diamonds. One carat equals 0.2 grams. Unlike moissanite which is sized by millimeter because its lower density means it weighs less than diamond at the same dimensions lab grown diamonds are sized and priced by carat weight directly comparable to natural diamond carat weights.

Our lab grown diamond collection includes certified stones with full specification documentation on each listing.

The Ethics and Environmental Picture

Lab grown diamonds eliminate the most significant ethical concerns associated with natural diamond mining. No land disturbance from open-pit or underground mining. No water contamination from mine runoff. No community displacement from mining operations. No exposure to conflict diamond supply chains.

The production process does have an environmental footprint significant energy consumption is required for both HPHT and CVD production. The environmental impact depends heavily on whether the production facility uses renewable energy. Some lab grown diamond producers are transparent about their energy sourcing; others are not. If environmental impact is a specific priority, asking the retailer about their supplier's energy sources is worth doing.

The Kimberley Process has reduced the flow of conflict natural diamonds significantly since its introduction in 2003, but has not eliminated the problem entirely. For buyers who want complete certainty about ethical sourcing, lab grown diamonds remove the question at the supply chain origin rather than relying on certification systems that remain imperfect.

Lab Grown Diamonds in Our Collection

Our lab grown diamond collection features certified lab grown diamonds in 10K gold settings genuine diamond with a clean supply chain in a durable precious metal base. The collection includes rings across every style category: solitaires, halos, three-stone designs, vintage-inspired settings, and wedding bands.

For buyers considering the full range of options including moissanite alongside lab grown diamonds, the following posts in this series cover the comparisons that help distinguish the right choice for a specific situation.

Moissanite vs Diamond: The Honest 2026 Comparison covers moissanite against diamond broadly.

Lab Grown Diamonds vs Moissanite: Which Should You Choose? compares the two lab-created alternatives directly.

Lab Grown Diamond Price Guide 2026 covers pricing in detail Day 11 of this series.

Frequently Asked Questions

Are lab grown diamonds real diamonds? Yes. Lab grown diamonds are chemically and physically identical to natural diamonds pure carbon in the diamond cubic crystal structure. The FTC's official definition of diamond includes lab grown stones. They are not simulated diamonds or imitations.

How are lab grown diamonds different from natural diamonds? The only meaningful difference is origin. Natural diamonds formed over billions of years in the earth's mantle. Lab grown diamonds are produced in controlled facilities in days to weeks. The material is the same.

Can you tell a lab grown diamond from a natural diamond? Not visually in normal conditions. Advanced spectroscopic equipment in gemological laboratories can identify growth patterns characteristic of HPHT or CVD production. Standard diamond testers do not distinguish them. Grading reports from GIA or IGI will specify whether a stone is natural or lab grown.

Are lab grown diamonds graded the same way as natural diamonds? Yes. The same 4C system cut, color, clarity, carat weight applies. GIA, IGI, and other major laboratories issue grading reports for lab grown diamonds using identical criteria to natural diamond reports.

Why are lab grown diamonds less expensive than natural diamonds? Production through HPHT or CVD is more efficient and scalable than mining. The supply of lab grown diamonds is not constrained by geological rarity. As production capacity has increased, prices have declined significantly 70 to 80% below natural diamond prices in 2026.

Do lab grown diamonds hold their value? Less so than natural diamonds. Lab grown diamond prices have been falling as production scales, which affects resale value. The resale market for lab grown diamonds is less established than for natural diamonds. Buyers typically choose lab grown for the wearing experience and value rather than investment potential.

Shop Lab Grown Diamonds at Zalkari

Our lab grown diamond collection features certified lab grown diamonds in 10K gold settings genuine diamonds with a clean supply chain and full specification documentation.

Moissanite Collection lab-created moissanite in certified 925 sterling silver

Sterling Silver Rings minimalist bands and stackable styles

Sterling Silver Earrings hypoallergenic studs and hoops

Birthstone Jewelry genuine gemstones in certified 925 silver settings

Fast shipping across the US. Easy returns. Real stones in real precious metal every time.