Certification
GIA vs. IGI vs. AGS: Which Lab to Trust?
Grading labs differ in strictness and specialisation. Here's how the major ones compare.
GIA
The world reference for natural diamonds and coloured diamonds; known for consistent, conservative grading.
IGI
Widely used for lab-grown diamonds and finished jewellery, with offices worldwide including Antwerp.
AGS
Known for scientific light-performance cut grading.
Coloured stones
For rubies, sapphires and emeralds, AGL, SSEF and Gübelin are the leading origin and treatment labs.
Verification tools & references
Every Riakoob piece arrives certified, insured and covered by our 12-month value promise.
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