How to Identify a Real Diamond

Diamonds are among the most counterfeited gemstones, making it essential to understand how to distinguish a genuine diamond from a fake. The most reliable way to ensure authenticity is by purchasing certified diamonds.


What Is Diamond Certification?

Certified diamonds are evaluated and documented by professional gemmological laboratories. Each certified diamond comes with an authenticity certificate, detailing its cut, colour, clarity, carat weight, and other characteristics. This certificate confirms the diamond’s value and authenticity.


Trusted Certification Laboratories

Reputable certificates are issued by internationally recognised institutions, including:

  • GIA – Gemological Institute of America
  • AGS – American Gem Society
  • HRD – Hoge Raad voor Diamant (Antwerp)
  • IGI – International Gemological Institute

Every certified diamond has a unique laser-inscribed identification number, visible under magnification. This number ensures full traceability and protects against fraud.


Why Certification Matters

Certification gives you confidence and transparency. Independent laboratories assess all key features of a diamond, such as:

  • Cut – how well the diamond reflects light
  • Colour – the presence or absence of tint
  • Clarity – internal or external imperfections

Note: Grading systems may vary slightly between laboratories. For example:

  • GIA uses “I” (Included), while HRD may use “P” (Piqué) to describe visible inclusions.
  • GIA uses letters for colour (D–Z), while AGS uses a numeric scale (0–10).


Certification at One Mo Diamond

At One Mo Diamond, we only offer diamonds certified by trusted, internationally recognised laboratories. This ensures that every stone you receive is genuine, accurately graded, and worthy of its value.

Some of our high-end pieces include multiple certificates, including both local assay office hallmarks and international gemmological reports.

Need help understanding diamond certificates? Contact our team at info@onemodiamond.com — we’ll be happy to explain everything clearly.

Example Certificates:

1. GIA Certificate – Detailed grading with international credibility


2. HRD Certificate 


3. IGI Certificate