What Is an IGI Certified Diamond and Should You Buy One?
An IGI certified diamond is a diamond that has been graded by the International Gemological Institute, usually called IGI. The grading report records key quality factors such as cut, color, clarity, carat weight, measurements, and whether the stone is natural or lab grown. On La Maison Val D'or, IGI-certified options appear across loose stones and finished jewelry, including an educational guide on IGI certified lab grown diamonds and specific products such as a 2.03CT IGI Lab Diamond CrissCut loose stone. fileciteturn0file6 fileciteturn0file12
Should you buy one? In many cases, yes, if the report is recent, the specs match the stone, and the price is appropriate for the diamond's actual quality. IGI is especially common in lab grown diamonds, while some buyers also compare it with GIA before making a final decision. fileciteturn0file6 fileciteturn0file17
What an IGI certification actually means
IGI certification does not mean a diamond is automatically high quality. It means an independent gem lab has examined the stone and issued a report describing its measurable characteristics. That report helps buyers compare diamonds using the same main grading categories instead of relying only on a seller description.
For lab grown diamonds, the report usually identifies growth method and confirms laboratory origin. Several store listings explicitly describe IGI-certified lab grown diamonds with details such as color, clarity, cut, and carat size, including loose stones in cushion, princess, marquise, trillion, and Criss Cut shapes. fileciteturn0file3 fileciteturn0file4 fileciteturn0file9 fileciteturn0file12 fileciteturn0file16
What information is on an IGI diamond report
An IGI report typically includes the diamond's shape and cutting style, measurements, carat weight, color grade, clarity grade, and cut grade when applicable. It may also list polish, symmetry, fluorescence, proportions, and identifying comments such as whether the stone is lab grown.
This information matters because two diamonds with the same carat weight can look very different once cut quality, proportions, and clarity are considered. If you are also comparing other grading labs, a related reference on GIA certified gems can help clarify how third-party certification is used in jewelry buying. fileciteturn0file17
IGI vs GIA: the comparison buyers usually need
The most common comparison is IGI versus GIA. Both are well-known gem grading labs, but buyers often see IGI more frequently in lab grown diamonds, while GIA remains a common point of reference for natural diamonds and broader certification discussions. The store's own content reflects this distinction by publishing separate guides for IGI-certified lab grown diamonds and GIA-certified gems. fileciteturn0file6 fileciteturn0file17
For a buyer, the practical question is not which lab name sounds better in the abstract. The better question is whether the report is legitimate, whether the diamond matches the report, and whether the overall price and visual performance make sense. If you are deciding between diamond origins as well, lab grown diamonds vs natural diamonds is the more important comparison after certification. fileciteturn0file17
Quick comparison
| Factor | IGI | Why it matters |
|---|---|---|
| Purpose | Independent grading report for diamond quality | Helps verify the stone's stated specs |
| Common use | Frequently seen with lab grown diamonds | Useful if you are shopping that category |
| Report content | 4Cs, measurements, proportions, and origin details | Lets you compare diamonds more accurately |
| Buying decision | Should be judged with price and visual quality | A certificate alone does not guarantee value |
When buying an IGI certified diamond makes sense
Buying an IGI certified diamond makes sense when you want independent documentation of the stone's quality and identity. This is especially useful for larger carat weights, higher prices, custom jewelry projects, and lab grown diamonds where precise specs matter.
For example, IGI-certified loose stones can be practical if you want to review the grading details before choosing a setting. Examples in the catalog include a 2ct IGI Cushion Lab Diamond and an 8Ct IGI Princess Lab Diamond. fileciteturn0file10 fileciteturn0file9
It can also make sense in finished jewelry when the center stone is a major value driver. The catalog includes examples such as an 10 Carat Pear Lab Diamond Ring and an IGI 10ctw Emerald Diamond Studs, where certification helps document the stated diamond quality. fileciteturn0file8 fileciteturn0file2
When you should look more carefully before buying
You should slow down if the seller mentions IGI certification but does not show the report number, a clear grading summary, or enough stone details to verify what you are paying for. You should also look more carefully when the price seems unusually high or unusually low compared with similar diamonds of the same size and grade.
Certification is one part of due diligence, not the entire process. For engagement purchases, it also helps to understand shape preferences, setting style, and overall diamond choice before deciding, especially if you are comparing certified center stones in lab grown diamond engagement rings or broader engagement ring options. fileciteturn0file1 fileciteturn0file6
How to decide if an IGI certified diamond is worth buying
- Read the report details, not just the word certified.
- Check cut, proportions, color, clarity, and measurements together.
- Confirm whether the diamond is natural or lab grown.
- Compare the diamond with similar stones of the same shape and grade.
- Judge the finished piece as a whole, including setting quality and metal.
If those points check out, an IGI certified diamond can be a reasonable and practical choice. The certificate gives you a documented starting point, but the best purchase decision still comes from combining the report with visual quality, price, and the kind of jewelry you actually want to wear.
FAQ
Is an IGI certified diamond a real diamond?
Yes. IGI certification means the diamond has been examined by a third-party lab. The report identifies whether the diamond is natural or lab grown and records its grading details.
Are IGI certified diamonds only lab grown?
No. IGI grades both natural and lab grown diamonds. However, IGI certification is especially common in the lab grown diamond market. fileciteturn0file6
Does IGI certification guarantee a good purchase?
No. A grading report helps verify the stone's stated characteristics, but value also depends on price, cut quality, proportions, and whether the diamond matches your needs.
Should you buy an IGI certified diamond instead of an uncertified one?
If you are comparing similar diamonds, certification usually gives you more reliable information for evaluation. That is particularly helpful for larger or more expensive stones.