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When shopping for a lab-grown diamond ring, you will encounter IGI certification. Some listings include it prominently. Others do not mention it at all. Here is exactly what IGI certification means, when it matters, and what to look for.
IGI stands for the International Gemological Institute. It is one of the world's largest independent diamond grading laboratories, and the leading certification body for lab-grown diamonds specifically. IGI grades diamonds using the same 4C system as the GIA -- cut, color, clarity, and carat -- and issues a certificate (called a report) that documents the grading.
Can Lab Grown Diamonds Be IGI Certified?
Yes. IGI was one of the first major laboratories to develop grading standards specifically for lab-grown diamonds, and it remains the most widely used certification body in the lab-grown diamond category. An IGI-certified lab-grown diamond has been independently verified for its cut, color, clarity, and carat by gemologists at IGI -- the grade on the certificate is not self-reported by the seller.
Is IGI as Reputable as GIA?
For lab-grown diamonds, IGI is the industry standard. The GIA has historically been considered the most prestigious grading authority for mined diamonds. IGI has built equivalent credibility specifically in the lab-grown diamond space -- their lab-grown diamond reports are widely accepted by the jewelry industry, by insurance providers, and by buyers globally.
Both institutions grade diamonds independently and with consistency. For lab-grown diamonds, IGI reports are the industry norm and are fully trusted.
When Does a Ronora Diamond Come With IGI Certification?
At Ronora, IGI certification is included for center stones of 1.0 carats and above. This follows the industry standard -- diamonds below 1 carat are typically not independently certified because the cost of certification relative to the stone's value is not justified for the buyer. Smaller diamonds in pavé settings, halos, and side stones are graded and selected to the same VVS, D-E-F standards but do not carry individual certificates.
For eternity bands with multiple stones, certification is not included unless a single stone in the band is 1 carat or above.
What Does the IGI Report Show?
- Shape and cutting style
- Measurements (length x width x depth in mm)
- Carat weight
- Color grade (D-E-F at Ronora)
- Clarity grade (VVS at Ronora)
- Cut grade, polish, and symmetry
- Fluorescence
- Growth method (CVD -- all Ronora diamonds)
- A unique report number verifiable online at igi.org
Browse IGI-eligible engagement rings or explore the full collection. All Ronora diamonds are CVD, VVS clarity, D-E-F colorless.
Frequently Asked Questions
Can lab grown diamonds be IGI certified?
Yes. IGI certifies lab-grown diamonds using the same 4C grading system as mined diamonds. An IGI report is the most widely used certificate for lab-grown diamonds in the industry.
Are IGI lab diamonds good?
IGI certification documents the quality -- it does not determine it. A high-quality IGI-certified lab diamond is one with excellent cut, D-E-F color, and VVS clarity grading as stated on the report. These grades are independently verified by IGI.
Is IGI as reputable as GIA?
For lab-grown diamonds, IGI is the industry standard certification body and is fully trusted by the jewelry trade, insurance providers, and buyers globally. Both GIA and IGI are reputable institutions; IGI has the most established specific expertise in lab-grown diamond grading.
How do I verify an IGI certificate?
Every IGI report has a unique report number. Enter this number at igi.org to verify the certificate and confirm the diamond's graded specifications match what was presented to you.
