When investing in fine diamond jewellery, whether it’s an exquisite diamond engagement ring, an elegant bridal diamond jewellery set, or a timeless diamond necklace, understanding diamond certifications is paramount. These certificates authenticate a diamond’s quality, ensuring transparency and value for money.
But with multiple grading institutions in the industry, how do you know which certification holds the most credibility? Let’s delve into the world of GIA, IGI, and AGS; the three most recognised diamond grading authorities.
GIA (Gemological Institute of America)
Renowned as the gold standard in diamond certification, GIA is the most respected and widely trusted gemmological laboratory. Established in 1931, the institute pioneered the 4Cs: Cut, Colour, Clarity, and Carat Weight, forming the universal language for diamond evaluation.
GIA-certified diamonds undergo rigorous testing with state-of-the-art equipment, ensuring unbiased assessments.
For those investing in custom diamond pieces like engagement rings, a GIA certification guarantees authenticity, making it a preferred choice among luxury buyers.
IGI (International Gemological Institute)
IGI is another well-known gem lab, particularly popular in Europe and Asia. While IGI-certified diamonds are respected in the industry, they sometimes exhibit slight leniency in grading when compared with GIA. This can make IGI-certified stones more budget-friendly whilst still maintaining high standards.
For customers seeking value without compromising on quality, IGI-certified diamonds present an attractive option, especially for larger pieces like statement diamond bracelets and necklaces.
AGS (American Gem Society)
If precision and light performance matter to you, AGS-certified diamonds stand out. Known for their scientific approach to grading, AGS developed a unique numerical scale to assess a diamond’s cut, particularly focusing on brilliance.
AGS-certified diamonds are ideal for those who prioritise cut quality above all else; think dazzling centre stones for diamond engagement rings or intricately designed heirloom pieces.
DBP Products Certification
All Solitaire engagement rings from Diamonds by Pelvi come with GIA certification, while all other jewellery items are IGI certified. However, it may vary only if a client specifically requests a different certification.
Diamond Certification FAQs
- Is AGS better than GIA?
Not “better”, but “different”. While GIA is the global benchmark for colour and clarity, AGS excels in cut precision (using a patented light-performance system). For a diamond with unmatched sparkle, AGS’s 0-10 cut grading is exceptional. But for resale value and universal recognition, GIA reigns supreme. - Is IGI-certified better than GIA?
No. IGI is reputable but generally less stringent than GIA, especially in colour/clarity grading. GIA’s consistency makes it the preferred choice for investment-grade diamonds (like solitaire engagement rings), while IGI offers accessible certification for everyday luxury pieces. - Is IGI only for lab-grown diamonds?
No—but it’s the dominant certifier for lab-grown stones. IGI also grades natural diamonds, particularly in commercial jewellery (think diamond bracelets or bridal sets). However, for natural diamonds, GIA’s certification carries more weight. - Why is GIA more expensive?
GIA’s rigorous grading process, global reputation, and strict anti-inflation policies (they never overgrade) justify the cost. You’re paying for:
- Unmatched accuracy
- Better resale value
- Trust
- Which diamond certification is best?
It depends on your priorities:
- Best overall: GIA
- Best cut analysis: AGS
- Best budget option: IGI
Final Thoughts
At Diamonds By Pelvi, we believe in empowering our customers with knowledge, ensuring that each piece, be it a delicate bridal diamond jewellery ensemble or a striking diamond bracelet, meets the highest standards of craftsmanship and authenticity. When choosing your next luxury diamond piece, let certification guide your decision, but always trust your eye for beauty and brilliance.
Looking for a customised diamond jewellery piece? Book an appointment today!
