---
title: "High Quality Lab-Grown Diamonds: Which Grades Are Worth Paying For"
byline: "Love & Carat"
series: which_grades_dont_matter
published: 2026-09-30T12:58:12.786Z
updated: 2026-09-30T12:58:12.786Z
canonical: https://loveandcaratnewyork.com/blog/high-quality-lab-grown-diamonds-grades-worth-paying-for
disclosure: editorial
sources:
  - "How GIA Grades Diamonds - https://www.gia.edu/gem-lab-how-gia-grades-diamond"
  - "Estimating Cut Grade booklet rev12-09 - https://my.gia.edu/dam/jcr:eb4f573d-f7a2-4750-a352-94fee1c12275/Estimating-a-cut-grade-booklet.pdf"
  - "A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds | Gems & Gemology - https://www.gia.edu/gems-gemology/fall-2004-grading-cut-quality-brilliant-diamond-moses"
  - "Diamond Cut | Understanding The Cut Scale | GIA 4Cs - https://4cs.gia.edu/en-us/diamond-cut/"
  - "Diamond Color | Gemological Institute of America - 4Cs - https://4cs.gia.edu/interactive-4cs/color/index.html"
  - "GIA Diamond Grading Reports: Understanding the Diamond Color Grade - https://4cs.gia.edu/en-us/blog/gia-diamond-grading-reports-understanding-diamond-color-grade/"
---

# High Quality Lab-Grown Diamonds: Which Grades Are Worth Paying For

_Written by Love & Carat about the stones we sell. Not an independent review._

**The short answer**

- Quality starts with cut, because it has a major effect on brightness and sparkle. GIA launched its cut grades for standard round brilliants of 0.15 carat and larger in the D-to-Z range in January 2006.
- For color, consider a G or H lab-grown diamond and check how it looks in your chosen setting; GIA describes color in the G-to-J range as often unnoticeable except by trained graders.
- For clarity, aim for a stone that is eye-clean, not flawless: GIA grades clarity at 10x magnification, and a characteristic seen under magnification may not be visible to the naked eye.
- Buy only certified lab-grown diamonds with an independent grading report, and spend what you save on a better cut or a larger stone.

A high-quality lab-grown diamond is, above all, a well-cut one, because cut decides how bright and lively the stone looks. After cut, you want color and clarity that look clean to your own eye, not the top of every scale, and an independent grading report to prove what you're buying. If a lower-grade stone looks just as clean and colorless to you in ordinary viewing, paying for D color or Flawless clarity may change the report more than what you notice.

## What should "high quality" mean for a lab-grown diamond?

A lab-grown diamond is described in the same terms as a natural one: cut, color, clarity and carat weight. The highest quality lab-grown diamonds, in the sense that matters day to day, are the ones that look brightest and cleanest when worn. They aren't necessarily the ones with the most impressive grades.

It helps to know how the grades are set. At GIA, a stone is [graded anonymously](https://www.gia.edu/gem-lab-how-gia-grades-diamond): references to its owner are removed, and it is tracked by an internal barcode. Color is judged in a standardized viewing environment, and clarity is examined under 10x magnification. Several graders give independent opinions, and a grade is final only once enough of them agree.

Those controlled conditions differ from the way you usually see a ring on a hand. Some differences a lab can grade are hard to see in ordinary light. That gap is where you can save money.

## Why does cut come first?

GIA puts it simply: [quality is in the cut](https://4cs.gia.edu/en-us/diamond-cut/). Cut describes how a stone handles light. That covers brightness (white light reflected back to you), fire (light split into spectral colors) and scintillation (the sparkle and the pattern of light and dark as the stone moves). A stone with top color and clarity but a poor cut can look glassy and dull. A strong cut makes a modest color grade look lively.

A few facts about how cut is graded:

- GIA's cut grading system for standard round brilliants, [D to Z colors and 0.15 carat and larger](https://my.gia.edu/dam/jcr:eb4f573d-f7a2-4750-a352-94fee1c12275/Estimating-a-cut-grade-booklet.pdf), launched on its reports in January 2006. It has five grades: Excellent, Very Good, Good, Fair and Poor.
- The system is ["deductive"](https://my.gia.edu/dam/jcr:eb4f573d-f7a2-4750-a352-94fee1c12275/Estimating-a-cut-grade-booklet.pdf): the overall grade is set by the lowest of its seven components. These are brightness, fire, scintillation, weight ratio, durability, polish and symmetry.
- GIA gives an overall [cut grade](https://4cs.gia.edu/en-us/diamond-cut/) to eligible standard round brilliants of 0.15 carat and larger in its D-to-Z color range; other laboratories may use different systems. GIA does not assign those fancy shapes an overall cut grade under that system.

GIA's research also found that [many different proportion sets](https://www.gia.edu/gems-gemology/fall-2004-grading-cut-quality-brilliant-diamond-moses) can produce a top-grade stone. You don't need to hunt for one "perfect" set of numbers. And taste plays a real part:

> The GIA cut grading system provides a useful assessment of a diamond’s overall cut quality, but only individuals can say which particular appearance they prefer.
> (A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds | Gems & Gemology)

For a round, we'd put the money into an Excellent cut grade before anything else. For a fancy shape, don't assume a report gives you a GIA overall cut grade; assess the actual stone's appearance too. Judge it by video and photographs of the actual stone, look for pleasing brightness and any overly dark bow tie, and read our [cut glossary](/education/cut) for what the measurements mean.

**Spend it on cut:** If your budget is fixed, protect the cut grade first. Consider stepping down in color or clarity before cut, provided the stone still looks white and eye-clean to you.

## Color: where does the eye stop seeing a difference?

The color scale runs from D (colorless) to Z. GIA is candid that the differences near the top are hard to see:

> Many of these color distinctions are so subtle that they are invisible to the untrained eye; however, these distinctions make a very big difference in diamond quality and price.
> (Diamond Color | Gemological Institute of America - 4Cs)

GIA's [color scale explainer](https://4cs.gia.edu/en-us/blog/gia-diamond-grading-reports-understanding-diamond-color-grade/) (published January 2016) groups the grades like this:

- **Colorless (D–F):** the most chemically pure stones in the range.
- **Near-colorless (G–J):** color is often unnoticeable except by trained graders.
- **Faint (K–M):** color is still difficult to see with an untrained eye.
- **Very Light (N–R):** color can be seen in larger stones.

The same explainer notes that each letter covers a narrow range. The difference within one grade is only noticeable to a trained grader. And in GIA's cut research, [differences in body color](https://www.gia.edu/gems-gemology/fall-2004-grading-cut-quality-brilliant-diamond-moses) didn't stop observers from judging how well a stone was cut. A stone's color grade alone doesn't tell you how lively its cut will look.

**Buy this instead:** consider a G or H lab-grown diamond with a strong cut rather than paying for D, E or F; compare actual stones and choose one that looks white enough to you in the setting you want.

**When the higher color grade is worth it:** compare higher grades if you notice warmth in the size, shape or setting you want, especially in a large step cut or beside a white metal. With yellow or rose gold, check whether a lower color grade still looks right to you.

## Clarity: aim for eye-clean, not flawless

Clarity grades describe internal and surface characteristics that graders find at [10x magnification](https://www.gia.edu/gem-lab-how-gia-grades-diamond). The grader plots them on a diagram of the stone. A characteristic visible under 10x magnification may not be visible to you face-up without a loupe. What you want is a stone that is [eye-clean](/education/eye-clean): nothing visible face-up at a normal viewing distance.

GIA's cut research found something that supports this. Apart from [cases of very low color or clarity](https://www.gia.edu/gems-gemology/fall-2004-grading-cut-quality-brilliant-diamond-moses), observers were generally able to separate those factors from their assessment of a stone's cut appearance. So a clarity grade alone doesn't tell you how lively the cut will look; check the actual stone for any visible inclusions.

**Buy this instead:** rather than paying for VVS or Flawless, look at eye-clean VS2 or SI1 stones. Check the plotting diagram on the report. Compare the report diagram with photos or video of the actual stone; check whether any inclusion is visible face-up, particularly near the center.

**When the higher clarity grade is worth it:** if an inclusion is visible in the step cut or large-table stone you want, compare it with a higher-clarity option. For an emerald cut or Asscher, we'd move up a clarity grade and look closely at the video before buying.

## Fluorescence, polish and symmetry: the small print

**Fluorescence.** A GIA report describes fluorescence as [None, Faint, Medium, Strong or Very Strong](https://4cs.gia.edu/en-us/blog/gia-diamond-grading-reports-understanding-diamond-color-grade/). It doesn't change the color grade, but it can change how color looks outside the lab. In bright sunshine, some stones with stronger blue fluorescence may look more colorless. Stones with Very Strong fluorescence may look hazy or oily. We'd happily accept None through Medium, and look carefully at a Very Strong stone before choosing it. Our [fluorescence glossary](/education/fluorescence) explains more.

**Polish and symmetry.** [Polish](https://4cs.gia.edu/en-us/diamond-cut/) describes the condition of the facet surfaces, and symmetry the exactness of the shape and facet placement. For a GIA-graded standard round brilliant, both contribute to the overall cut grade. We wouldn't pay extra to see "Excellent" on every line once the stone looks bright and lively in video. On fancy shapes, poor symmetry can show as a lopsided outline, so it deserves a look there.

## Why certified lab-grown diamonds are the only kind to buy

An independent grading report gives you a basis for checking the stated grades rather than relying only on a seller's description. Every diamond we sell comes with a GIA or IGI grading report. We never suggest skipping certification to save money, because the report is what lets you compare two stones fairly.

A report is also a check on what the stone is. GIA says it screens all items submitted for diamond grading services with its [DiamondCheck instrument](https://www.gia.edu/gem-lab-how-gia-grades-diamond) to identify natural diamonds, material that may need further testing (including possible lab growth), and non-diamond material. You can look up GIA reports through [GIA's own tools](https://4cs.gia.edu/en-us/diamond-cut/). For a GIA report, use [GIA's Report Check tool](https://4cs.gia.edu/en-us/diamond-cut/); for an IGI report, ask IGI how to verify it. Our [certificate glossary](/education/certificate) explains what's on one.

Two plain notes:

- A grading report is not an appraisal of value, and we don't value stones ourselves. If your insurer wants a valuation, they may ask for an independent appraisal.
- No diamond, lab-grown or natural, is an investment. Buy the stone because you love how it looks.

## How to buy the best lab-grown diamond for your budget

The best lab-grown diamonds for most people follow a simple recipe:

1. **Cut:** Excellent for a round; for a fancy shape, even brightness in video and a pleasing outline.
2. **Color:** G or H (lower in yellow or rose gold; higher for large step cuts in white metal).
3. **Clarity:** eye-clean, typically VS2 or SI1, checked against the plotting diagram.
4. **Fluorescence:** None to Medium, or Strong if the video looks clear.
5. **Report:** GIA or IGI; use [GIA's Report Check tool](https://4cs.gia.edu/en-us/diamond-cut/) for a GIA report, or ask IGI how to verify its report.

An eye-clean, near-colorless stone can look just as appealing on the hand as a D, Flawless stone; compare actual stones and prices before paying for grades you cannot see. You can keep the difference, or spend it on a larger carat weight or a better setting.

**The grades worth paying for are the ones you can see: cut first, then color and clarity only up to the point where your eye stops noticing.**

You can browse [center stones for engagement rings](/) with these grades in mind. Every order ships insured and signed for. Read our [returns policy](/policies/returns) before ordering to understand the terms for a delivered stone.

**Compare two, not twenty:** Once you've set your grades, pick two stones that meet them and compare the videos side by side. If both meet your cut and durability criteria, choose the one that looks livelier to you.

## Frequently asked questions

**What is the highest rated lab-grown diamond?**

On paper, the top of each scale is D color, Flawless clarity and, for a standard round brilliant, an Excellent GIA cut grade. The highest-rated stone isn't necessarily the best buy, though: past the point where your eye stops seeing a difference, the extra grades change the report and the price, not the look.

**Which brand is best for lab-grown diamonds?**

Look past the brand name to the stone and its paperwork. The best seller for you shows the full grading report from an independent laboratory, gives clear photos or video of the actual stone, and publishes its returns and shipping terms before you pay.

**How much should a high-quality lab-grown diamond cost?**

There's no single fair figure, because price moves with carat weight, shape, cut and the color and clarity you choose. Lab-grown diamonds usually cost less than comparable natural ones. The simplest way to lower the cost without changing the look is to step down in color and clarity while keeping the cut strong.

**What is the downside of lab-grown diamonds?**

The main thing to understand is that no diamond, lab-grown or natural, is an investment, and nobody can honestly promise you resale value. Buy one because you love how it looks, not to store money.

**What size lab-grown diamond can you get for $5,000?**

It depends on the shape, cut, color and clarity you choose, and prices change, so we won't quote a size. To prioritize visible size, compare near-colorless, eye-clean stones instead of automatically paying for top color and clarity; for a qualifying GIA-graded round, keep a strong cut grade.