Diamond Certification (GIA/IGI)

Diamond Certification

Understanding GIA & IGI — Your Guarantee of Quality and Authenticity

Every diamond you purchase from NYX Jewel comes with an independent grading certificate from a trusted gemological institute. This certificate is your assurance that the diamond has been evaluated by experts using rigorous, standardized criteria.

What Is GIA?

The Gemological Institute of America (GIA) is the world's most respected and recognized authority on diamonds, colored stones, and pearls. Founded in 1931, GIA created the universally accepted standard for grading diamonds — the 4 C's (Cut, Color, Clarity, Carat). A GIA certificate provides an unbiased, detailed analysis of a diamond's quality characteristics.

What Is IGI?

The International Gemological Institute (IGI) is one of the world's largest independent gemological laboratories, established in 1975. IGI is particularly renowned for its expertise in grading lab-grown diamonds. An IGI certificate provides comprehensive details about a diamond's cut, color, clarity, carat weight, and additional quality factors.

What Does a Certificate Include?

A diamond grading certificate typically includes:

  • Carat Weight: The precise weight of the diamond.
  • Cut Grade: How well the diamond has been cut and its proportions.
  • Color Grade: The diamond's color rating on the D–Z scale.
  • Clarity Grade: The presence and visibility of inclusions or blemishes.
  • Measurements: Exact dimensions in millimeters.
  • Polish & Symmetry: Quality of the diamond's surface finish and alignment.
  • Fluorescence: Whether the diamond emits visible light under UV.
  • Diamond Plot: A diagram showing the location and type of any inclusions.
  • Origin: Whether the diamond is natural or lab-grown.

Why Certification Matters

A certified diamond gives you confidence in your purchase. The certificate acts as a diamond's identity card — confirming its characteristics independently and objectively. Without certification, you're relying on the seller's word alone. At NYX Jewel, we believe in complete transparency, which is why every diamond we sell comes with a trusted certification.

NYX Jewel's Certification Promise

Every NYX Jewel diamond is accompanied by either an IGI or GIA certificate, verifying its quality and confirming it as a genuine lab-grown diamond. In addition, you receive a NYX Jewel certificate of authenticity — our personal guarantee of ethical sourcing, premium craftsmanship, and lasting beauty.