Important Note: You must press the orange Donate button next to each organization that GIA vs IGI for Lab Created Diamonds: What Buyers Should Know is fundraising for so that your donation is attributed to GIA vs IGI for Lab Created Diamonds: What Buyers Should Know!
Lab created diamonds have become a popular alternative to mined diamonds, but choosing the right grading report can be confusing. Two names that frequently appear when shopping for these stones are the Gemological Institute of America (GIA) and the International Gemological Institute (IGI).
If you are comparing GIA vs IGI, lab created diamonds should be evaluated not only by the laboratory name but also by the grading system, report details, diamond quality, and the information provided to the buyer.
This guide explains the main differences between GIA and IGI for lab created diamonds and what those differences mean when purchasing a stone.
Lab created diamonds, also called laboratory-grown or lab-grown diamonds, are diamonds produced in controlled laboratory environments rather than formed naturally underground.
They are commonly produced using two technologies:
Both processes can produce gem-quality diamonds. GIA explains that laboratory-grown diamonds are chemically and optically similar to natural diamonds, although their growth characteristics allow professional laboratories to identify their origin.
A lab created diamond is therefore not the same thing as a diamond simulant such as cubic zirconia. It is diamond material created through a technological process.
The biggest difference between gia vs igi for lab created diamonds is how they currently communicate quality.
IGI continues to use the traditional 4Cs system-carat weight, color, clarity, and cut-for both natural and lab-grown diamonds. IGI states that it introduced lab-grown diamond grading in 2005 and continues to apply the 4Cs to these stones.
GIA changed its approach in October 2025. Its current Laboratory-Grown Diamond Quality Assessment classifies qualifying colorless-to-near-colorless lab-grown diamonds as either Premium or Standard, based on an overall evaluation of characteristics including color, clarity, and cut.
This means a buyer comparing a current GIA assessment with an IGI report may not see directly equivalent terminology.
IGI’s lab-grown diamond reports provide information about the stone’s identity, measurements, and 4Cs.
An IGI laboratory-grown diamond report can include:
IGI explains that its reports identify whether the stone is natural or laboratory-grown and provide the relevant 4Cs assessment.
For shoppers, this can make it relatively straightforward to compare two lab created diamonds based on their reported color, clarity, cut, and carat weight.
For example, two round lab-grown diamonds may both weigh 2.00 carats, but their color, clarity, proportions, and cut grades can differ considerably.
GIA has a long history of identifying and evaluating laboratory-grown diamonds. It began grading laboratory-grown diamonds in 2007.
However, GIA’s current system is different from its traditional natural-diamond grading approach.
As of October 1, 2025, GIA’s revised laboratory-grown service uses Premium and Standard quality assessments rather than the traditional color and clarity nomenclature developed for natural diamonds. GIA says the assessment considers color, clarity, and cut-related factors.
GIA announced that the change was intended to reflect the relatively narrow range of color and clarity found in most manufactured diamonds.
Existing GIA laboratory-grown reports issued under the previous system remain valid.
| Feature | GIA | IGI |
|---|---|---|
| Lab-grown diamond identification | Yes | Yes |
| Lab-grown grading | Yes | Yes |
| Traditional 4Cs terminology for current lab-grown reports | No for the current GIA quality assessment | Yes |
| Current lab-grown quality terminology | Premium / Standard | 4Cs |
| Identifies lab-grown origin | Yes | Yes |
| Reports growth information on applicable services | Yes, depending on service/report | Yes, depending on report |
| Report verification | Available | Available |
The laboratories therefore provide somewhat different reporting experiences. IGI emphasizes detailed 4Cs communication, while GIA’s current service uses a broader quality-assessment format for lab-grown diamonds.
No.
A GIA or IGI report does not change the physical diamond. The laboratory evaluates and documents the stone; it does not manufacture the diamond or improve its underlying material.
The actual appearance of a lab created diamond still depends on factors such as:
This is important because a grading report should be treated as an important source of information, not as a substitute for examining the actual stone.
A laboratory report provides independent documentation about the diamond you are considering.
This becomes particularly important with lab created diamonds because buyers need to know whether they are purchasing a natural diamond, laboratory-grown diamond, or another material.
GIA says its laboratory-grown diamonds are laser-inscribed with “Laboratory-Grown” and the relevant quality assessment number.
IGI also provides reports identifying the diamond as laboratory-grown and documenting its characteristics.
Before buying, it is sensible to verify the report number through the issuing laboratory’s official verification system.
Rather than treating the laboratory name as the only deciding factor, compare the actual diamond and the documentation supplied with it.
For an IGI-graded stone, the 4Cs give you a familiar framework for comparing specifications.
For a current GIA laboratory-grown assessment, the Premium or Standard designation provides a different type of quality summary.
The important point is that GIA and IGI’s current lab-grown reporting systems are not directly interchangeable. A “Premium” GIA assessment should not automatically be treated as equivalent to a particular IGI color-and-clarity combination without examining the underlying information available for the stone.
A certificate or grading report is only one part of evaluating a lab created diamond.
Two stones with the same carat weight and similar reported grades can look different because of their proportions and cutting quality. For round diamonds especially, examining the stone’s proportions, symmetry, polish, and visual performance can provide useful additional information.
If you are buying online, look for:
These details can be more useful than focusing exclusively on the laboratory name.
It is important not to assume that a GIA report automatically makes a lab created diamond more valuable, or that an IGI report automatically means lower quality.
The market price of a lab created diamond depends on numerous factors, including the stone’s characteristics, shape, size, cut quality, seller, market conditions, and the terms of the sale.
Also, laboratory-grown diamonds generally have different market dynamics from natural diamonds. A grading report documents quality characteristics; it does not guarantee future resale value or investment performance.
When comparing GIA vs IGI for lab created diamonds, the biggest distinction today is the grading approach.
IGI continues to use the familiar 4Cs framework for lab-grown diamonds, making its reports relatively straightforward for consumers who want to compare color, clarity, cut, and carat weight.
GIA currently uses its revised laboratory-grown quality assessment system, which categorizes qualifying stones as Premium or Standard rather than applying its traditional natural-diamond nomenclature.
For either option, verify the report, understand exactly what the report describes, inspect the individual diamond, and compare the complete specifications before purchasing. The best choice for a buyer depends on how much detail they want from the report and which characteristics matter most to them.
Note: Diamond grading services and report formats can change over time. The GIA information above reflects its laboratory-grown services in effect from October 1, 2025, while IGI’s position reflects information published in 2025-2026.
Important Note: You must press the orange Donate button next to each organization that GIA vs IGI for Lab Created Diamonds: What Buyers Should Know is fundraising for so that your donation is attributed to GIA vs IGI for Lab Created Diamonds: What Buyers Should Know!
Visit our Fundraisers page for more information!
