When buying a diamond, one of the most important things to check is its certification. A diamond certificate (or grading report) verifies the stone’s quality based on the 4Cs: cut, color, clarity, and carat. Two of the most well-known and widely used certification bodies are the GIA (Gemological Institute of America) and the IGI (International Gemological Institute). But which certification can you trust more? Let’s break it down.

What Is GIA?

The Gemological Institute of America (GIA) is the world’s most respected authority in diamond grading. Founded in 1931, GIA created the 4Cs grading system and continues to set the industry standard for consistency, accuracy, and reliability.

Key Points about GIA:

• Extremely strict grading standards.
  
  
• Certificates trusted globally.
  
  
• Higher resale value due to reputation.
  
  
• Often used for natural diamonds, especially in high-value jewellery.
  
  

What Is IGI?

The International Gemological Institute (IGI) is a globally recognized lab known for grading both natural and lab grown diamonds. Established in 1975, IGI is particularly popular in lab grown diamond certification, where it dominates the market.

Key Points about IGI:

• Widely used for lab grown diamonds.
  
  
• Faster turnaround times and more affordable grading costs.
  
  
• Certificates recognized by most retailers worldwide.
  
  
• Slightly looser grading compared to GIA, but reliable for buyers who value accessibility.
  
  

 

IGI vs GIA: Key Differences

 

Which Certification Should You Trust?

• For Natural Diamonds: GIA is considered the gold standard for grading, making it the better choice for buyers looking for investment-grade stones or high resale value.
  
  
• For Lab Grown Diamonds: IGI is more commonly used and trusted, offering consistency and affordability without compromising quality.
  
  

Both certifications are legitimate and provide transparency, but the choice depends on what type of diamond you’re buying and your priorities.

 

FAQs on IGI vs GIA

Q1. Are IGI-certified diamonds real?

 Yes, IGI certifies both natural and lab grown diamonds, and they are 100% real.

Q2. Why do GIA diamonds cost more?

 GIA grading is stricter and carries higher prestige, often increasing resale value.

Q3. Is IGI certification good for lab grown diamonds?

 Yes, IGI is the leading certification body for lab grown diamonds worldwide.

Q4. Can I trust IGI certificates as much as GIA?

 Yes, but note that IGI grading is slightly more lenient, whereas GIA is stricter.

Q5. Which is better for an engagement ring—IGI or GIA?

 Both are fine, but GIA is ideal for natural diamonds, while IGI is best for lab grown.