Lab-Grown Diamonds · Buying Guide

Lab-Grown vs Natural Diamonds: The Complete 2026 Comparison

By Tushar Leclerc · 8 min read

Last Updated: July 12, 2026

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Walk into most stores and the difference between lab grown and natural diamonds gets wrapped in a lot of careful language. Here it is without the spin: a lab-grown diamond is a diamond. Not a copy, not a "simulant," not a stand-in. It is carbon arranged in the exact same crystal structure as a stone pulled out of the ground, and no one — not your jeweler, not a gemologist with a loupe — can tell the two apart by looking.

That single fact changes the whole decision. Once you know both stones are physically the same, the question stops being "which is the real one" and becomes "why would I pay five to ten times more for the older one?" For most people, the honest answer is that they wouldn't. But the choice deserves a real explanation, so let's go through it properly.

What is a natural diamond?

A natural diamond is pure carbon that crystallized deep in the earth's mantle, roughly 100 miles down, under extreme heat and pressure, over one to three billion years. Volcanic activity carried these stones toward the surface, where they're mined, cut, and polished.

Their appeal is partly the stone and partly the story: something ancient, rare, and formed by geology. That romance is real, and for some buyers it matters. Natural diamonds also have a longer, more established resale market, though as we'll cover below, "resale value" on any diamond is weaker than the industry implies.

What is a lab-grown diamond?

A lab-grown diamond is the same crystal, grown above ground instead of below it. Two methods produce them:

• CVD (Chemical Vapor Deposition) grows the crystal layer by layer from carbon-rich gas.
• HPHT (High Pressure, High Temperature) recreates the mantle's conditions directly.

Both finish with a stone that is chemically, physically, and optically identical to a mined diamond. It has the same hardness, the same refractive index, and the same fire. The difference is time and cost, not quality. Every lab-grown diamond in our engagement ring collection is grown this way and arrives with an IGI certificate.

Are lab-grown diamonds real diamonds?

Yes. This is the point people trip over most, so it's worth being blunt.

In 2018 the U.S. Federal Trade Commission removed the word "natural" from its official definition of a diamond. Its position is that a diamond is a diamond whether it grew in the ground or in a lab. The two leading grading labs, GIA and IGI, grade lab-grown diamonds using the same four measures — cut, color, clarity, and carat — that they apply to mined stones.

So when you compare lab created diamonds vs real diamonds, you're comparing two things that are both real diamonds. The only stones that aren't diamonds are simulants like moissanite and cubic zirconia, which are different materials entirely. We break those down in our guide to diamond simulants.

Lab-grown vs natural diamonds: side by side

The top half of that table is the part that surprises people: line for line, the stones are the same. The differences only appear in origin, price, and ethics.

How much cheaper are lab-grown diamonds?

Lab-grown diamonds typically cost 60–85% less than a mined diamond of the same cut, color, clarity, and carat weight. The gap widens as the stone gets bigger, because mined diamonds get exponentially more expensive with size while lab-grown pricing stays closer to linear.

A concrete example: a two-carat mined round brilliant in a good color and clarity often lands between $15,000 and $22,000. A lab-grown stone of the same specification starts around $1,300 at Riona. That isn't a quality difference. It's the difference between a supply chain built on scarcity and one built on manufacturing. Because you're paying less per carat, most buyers use lab-grown to get a larger or cleaner stone than their budget would otherwise allow.

2 Carat Round Solitaire From $1,369

If you want to see how clarity affects that price, a lab grown diamond clarity chart runs from Flawless down through VS and SI grades; for an eye-clean look at the best value, VS2 to SI1 is the range most people land on.

Can anyone tell the difference?

No — not without specialized lab equipment. This is worth repeating because it's the fear that keeps people paying more. A jeweler examining your ring under a loupe cannot tell a lab-grown diamond from a mined one. The only way to distinguish them is with instruments that read the trace elements and growth patterns, which is exactly how grading labs inscribe the stone's origin on its certificate.

So the question "will people know it's lab grown" has a simple answer: only if you tell them.

Resale and value: the honest part

Here's where we'll be more candid than most sellers. Diamonds of any kind are a poor financial investment. The retail markup means a mined diamond usually resells for a fraction of what you paid, and lab-grown resale value has fallen further as production has scaled and prices have dropped.

If resale is genuinely central to your decision, a natural diamond holds a modest edge today, and you should know that going in. But for the vast majority of buyers, a ring is bought to be worn and kept, not sold. Framed that way, spending five times more for a marginally better resale position on something you never intend to sell rarely adds up. Buy the stone you love at a price that feels right, and treat resale as a bonus you're unlikely to use.

Ethics and environment

A lab-grown diamond is conflict-free by origin — there's no mine, so there's no question of where it came from. It also carries a substantially smaller footprint: growing a diamond uses far less land and water than extracting one, and the carbon impact is up to around 85% lower.

Mined diamonds aren't automatically unethical; certified, responsibly sourced stones exist. But if a clean origin matters to you and you'd rather not investigate a supply chain, lab-grown removes the question entirely.

So which should you choose?

Choose a natural diamond if the billion-year origin story is meaningful to you, or if resale value is a genuine priority you've thought through.

Choose a lab-grown diamond if you want the same stone — same sparkle, same hardness, same certificate — for a fraction of the price, with a clean origin and the option of a bigger or better center stone for your budget.

Most of our customers choose lab-grown once they understand the two are physically identical. Explore a few of our most-loved designs below, or book a free consultation if you'd like help deciding.

2 Carat Round Halo From $1,369

2 Carat Three-Stone From $1,369

2 Carat Cushion Solitaire From $1,369

Frequently asked questions