IGI vs GIA Diamond Certification — Which Is Better?
IGI vs GIA: What's the Difference?
IGI (International Gemological Institute) and GIA (Gemological Institute of America) are the two most trusted and widely recognised diamond grading laboratories in the world. Both issue diamond certificates that assess the 4Cs (Cut, Colour, Clarity, Carat), both use internationally standardised grading scales, and diamonds certified by either laboratory are accepted by jewellers and buyers worldwide, including in South Africa.
IGI vs GIA: Direct Comparison
| Factor | GIA | IGI |
|---|---|---|
| Founded | 1931 (USA) | 1975 (Belgium) |
| Primary strength | Natural diamond grading | Lab-grown diamond grading (world's largest) |
| Lab-grown certification | Yes (introduced 2019 for origin reports) | Yes — industry standard for lab-grown |
| Grading consistency | Stricter on colour and clarity for naturals | Slightly more lenient on some grades |
| Market recognition | Highest for natural diamonds | Highest for lab-grown diamonds |
| Report turnaround | Slower (premium positioning) | Faster (high volume lab-grown expertise) |
| Verification | gia.edu portal with certificate number | igi.world portal with report number |
Why IGI for Lab-Grown Diamonds?
IGI became the industry standard for lab-grown diamond certification for a simple reason: they invested deeply in the technology and expertise required to grade lab-grown stones at scale earlier than GIA. Today, the vast majority of lab-grown diamonds traded globally carry IGI certification. When South African buyers purchase a lab-grown diamond from a reputable retailer like Orbit Rings, the stone will almost always be IGI certified.
Orbit Rings uses IGI certification for all lab-grown and natural diamonds. Every IGI certificate includes the diamond's 4Cs grade, the growth method (for lab-grown: CVD or HPHT), and a unique laser inscription on the diamond's girdle matching the report number.
Why GIA for Natural Diamonds?
GIA is the most respected certification for natural diamonds, particularly in the traditional luxury jewellery segment. GIA grades are considered the most stringent and consistent for natural stones, and GIA certification commands a premium in the secondary market (resale). For natural diamond purchases above R50,000 where resale consideration matters, GIA certification is the preferred choice.
Can I Trust an IGI Certificate?
Yes. IGI is a fully independent, internationally accredited gemological laboratory founded in 1975 with offices in over 20 countries. IGI certificates are recognised by all major diamond exchanges, insurance companies, and jewellers worldwide. An IGI certificate provides the same level of assurance as a GIA certificate for the purposes of a ring purchase.
How to Verify a Diamond Certificate
- IGI: Go to igi.world, enter the report number from the certificate.
- GIA: Go to gia.edu, enter the report number from the certificate.
All diamonds sold by Orbit Rings are laser inscribed with their IGI report number on the girdle (the outer edge of the diamond) — this can be read under magnification and matched to the certificate for permanent verification.
Frequently Asked Questions — IGI vs GIA
Is IGI as good as GIA?
For lab-grown diamonds: IGI is the global industry standard and is fully trusted. For natural diamonds: GIA is generally considered the strictest and most prestigious certification, though IGI is still fully credible and accepted. For everyday ring purchases in South Africa, IGI certification is entirely sufficient for both lab-grown and natural stones.
Does an IGI certified diamond cost more?
Certified diamonds command a premium over uncertified diamonds. The certification itself costs the retailer money and confirms that the stone grades are independently verified. Both IGI and GIA certification add value — IGI premiums are typically slightly lower than GIA for equivalent natural stones, but both are considered premium over uncertified.
Why does Orbit Rings use IGI certification?
Orbit Rings uses IGI because it is the universally accepted standard for lab-grown diamonds — which form a significant part of our offering — and because IGI provides full, independently verifiable 4Cs certification for all stones. Every Orbit Rings diamond (lab-grown and natural) comes with an IGI certificate and laser inscription.
What does an IGI certificate tell you?
An IGI diamond certificate states: the diamond's shape and cutting style; measurements in mm; carat weight; cut grade; colour grade; clarity grade; polish and symmetry grades; fluorescence; and for lab-grown diamonds, the growth method (CVD or HPHT). The report number is laser-inscribed on the diamond's girdle for permanent verification.
Take Certification Research Into the Buying Flow
Once certification makes sense, compare your options on the diamonds page, begin the ring brief on Build Your Own Ring, or revisit the lab-grown guide and engagement hub if certification is only one part of a bigger decision.
ORBIT™
Since 2018, Orbit™ has pioneered boundaries in design and manufacturing, evolving from a ring brand to a global lifestyle name. Today, we cater to all aspects of everyday wearables and everyday carry, connecting our community to endless adventure and marking special moments in their lives.
Our versatile collection includes rings, jewellery, wallets, gear, bags, and watches. Each product is crafted with the same core principles that made us the most innovative ring brand: high-quality materials, thoughtful design, and unparalleled functionality.
