IGI Certification
Your diamond's official, independent grading report — the proof behind every promise we make
An IGI Diamond Report — Your diamond's official identity document
What is IGI?
The International Gemological Institute (IGI) is one of the world's largest and most respected independent gemological laboratories. Founded in 1975, IGI operates laboratories across four continents and has certified millions of diamonds.
IGI certification provides an unbiased, expert assessment of your diamond's quality. Each diamond is evaluated by multiple gemologists using standardized criteria, ensuring consistent and accurate grading.
For lab grown diamonds, IGI is the industry leader—they were pioneers in developing grading standards specifically for laboratory-grown diamonds and clearly identify them as such on every report.
Every diamond at 2N Diamonds comes with an IGI certificate, giving you complete confidence in what you're purchasing.
This is what lets you buy from us the same way you would from a name on Fifth Avenue — except for at least 45% below boutique. The grade is not our word; it is verified by an independent lab with no stake in the sale. After more than 20 years buying at the wholesale level, we reject roughly 70% of the diamonds we review, and the certificate is your proof that what reached you truly passed.
IGI — Trusted worldwide since 1975
What's on Your Certificate
Detailed view of IGI grading information
Every IGI certificate includes:
Report Number: Unique identifier laser-inscribed on the diamond
Shape & Cut: The diamond's shape and cutting style
Measurements: Precise dimensions in millimeters
Carat Weight: Weight to the hundredth of a carat
Color Grade: D-Z scale rating
Clarity Grade: FL to I3 scale rating
Cut Grade: Ideal to Poor (for round brilliants)
Polish & Symmetry: Quality of finish
Fluorescence: None to Very Strong
Origin: Clearly marked "Laboratory Grown"
The Clarity Plot
The back of your IGI report includes a clarity plot—a diagram showing the location, size, and type of any inclusions or blemishes found in your specific diamond.
This plot serves as your diamond's unique "fingerprint." No two diamonds have identical inclusion patterns, making this diagram useful for:
• Identification: Verify you received the certified diamond
• Insurance: Document for appraisals and claims
• Understanding: Know exactly what's inside your stone
Symbols in red indicate internal inclusions. Symbols in green indicate surface blemishes.
Clarity plot showing inclusion locations
Back of IGI report with clarity diagram and additional details
Laser Inscription
Microscopic laser inscription on the girdle
Many IGI-certified diamonds, including higher-grade 2N stones, carry a laser inscription on the girdle, the thin edge between the crown and pavilion. Where present, this microscopic engraving includes the IGI report number and "LG" (Laboratory Grown) designation. Most stones under four carats are not inscribed. Most stones under four carats are not inscribed.
The inscription is invisible to the naked eye but easily visible under 10x magnification. It provides:
• Permanent link between diamond and certificate
• Verification that you received the correct stone
• Security in case of loss or theft
• Transparency about lab grown origin
Your jeweler can show you the inscription using a loupe or microscope.
Close-up view of laser inscription on diamond girdle
The Grading Process
IGI's grading process is rigorous and designed to eliminate bias:
1. Submission: Diamonds arrive with no identifying information
about origin, owner, or expected grades.
2. Initial Assessment: A gemologist evaluates the diamond's
4Cs under standardized lighting conditions.
3. Verification: A second gemologist independently grades the
same diamond without seeing the first assessment.
4. Quality Control: A senior gemologist reviews any discrepancies
and makes final determinations.
5. Documentation: All findings are recorded and the certificate
is generated.
6. Inscription: Where a stone is inscribed, the report number is laser-inscribed on the girdle.
Expert gemologist examining a diamond
Verify Your Certificate Online
Every IGI certificate can be verified online using the report number. Simply visit IGI's Report Check service and enter your certificate number to:
• Confirm the certificate is authentic
• View all grading details
• Access digital copies of the report
• Verify the diamond matches the certification
Why We Choose IGI
Global Recognition
IGI certificates are accepted by jewelers, insurers, and appraisers worldwide. Your certificate will be recognized anywhere you go.
Lab Grown Expertise
IGI pioneered certification standards for lab grown diamonds. Their expertise in this category is unmatched in the industry.
Consistent Standards
With standardized grading across all laboratories, you can trust that grades are consistent regardless of where the diamond was certified.
Complete Transparency
Every certificate clearly states "Laboratory Grown Diamond"—complete honesty about origin with no ambiguity.
Every Diamond, Certified
Every diamond in our vault includes an IGI certificate. Browse with confidence knowing each stone has been independently verified for quality and authenticity.
Explore Our Diamonds