Your Guarantee of Authenticity

Every diamond,
independently certified.

A diamond is a significant purchase and a symbol of a moment you want to last a lifetime. Your confidence should be as clear as the diamond itself — which is why every diamond we sell is accompanied by an independent GIA or IGI grading report and laser-inscribed with its unique report number.

GIA Certified
Natural
IGI Certified
Lab-Grown
Laser-Inscribed
Girdle
Online
Report Verify
The Blueprint

Your diamond’s fingerprint, on paper.

A diamond grading report — also called a certificate — is a detailed blueprint of your diamond produced by a third-party, independent gemological laboratory. It provides an unbiased, expert assessment of every important characteristic: Cut, Colour, Clarity, Carat, proportions, finish, fluorescence, and the position of any inclusions.

An independent report is non-negotiable, because it means your diamond’s quality has been validated by the world’s leading authorities — not just by the seller. It is your absolute assurance of quality, authenticity and value, and your record of what you own for a lifetime.

“A grading report is how a diamond speaks for itself. No subjective opinions — just the measured truth, from the world’s leading laboratories.”
World-Leading Standards

Two laboratories. One standard of trust.

We work exclusively with the most respected independent laboratories — each a world leader in their field. Every natural diamond we sell is GIA certified. Every lab-grown diamond is IGI certified.

For Natural Diamonds

GIA

Gemological Institute of America

The Gemological Institute of America is the world’s foremost authority on natural diamonds. Founded in 1931, GIA developed the 4Cs and created the international diamond grading system used today.

A GIA certificate is the global gold standard, recognised the world over for its rigorous, consistent and impartial grading. When you choose a natural diamond from Monroe Yorke, your GIA report is your proof of quality.

  • Independent assessment of all 4Cs
  • Laser-inscribed report number on the girdle
  • Verifiable online via GIA Report Check
  • Full Grading Report (1.00ct+) or Dossier (under 1.00ct)
For Lab-Grown Diamonds

IGI

International Gemological Institute

The International Gemological Institute is the leading authority for the certification of lab-grown diamonds, and the world’s largest independent gemological laboratory. IGI applies the same rigorous grading standards to lab-grown diamonds that GIA applies to natural.

Every lab-grown diamond we sell is graded, certified and laser-inscribed by IGI — giving you the same detailed analysis and assurance of quality, for these modern marvels.

  • Independent assessment of all 4Cs
  • Laser-inscribed report number on the girdle
  • Verifiable online via IGI Report Check
  • Identifies growth method (HPHT or CVD) and any treatments
The Unbreakable Link

A microscopic signature,
forever.

How can you be certain that the diamond you receive is the exact same one detailed in your report? The answer is laser inscription.

Each GIA and IGI certified diamond has its unique report number microscopically laser-inscribed onto its girdle — the thin outer edge of the stone. The inscription is invisible to the naked eye but can be read under a jeweller’s loupe or microscope.

This inscription is your unbreakable link: tangible proof that connects your physical diamond directly to its grading report, guaranteeing its identity for the life of the diamond. Verify it any time using the official online portals below.

Verify a GIA Report Verify an IGI Report
GIRDLE GIA 1234567890 Report number, microscopically engraved Your report number, engraved so small it’s invisible to the eye — and permanent for the life of the diamond.
Report Anatomy

What’s on your grading report

Each laboratory produces a slightly different report depending on the diamond. Here’s what to expect from the three reports you’ll see at Monroe Yorke.

GIA Diamond Grading Report

Issued for every natural diamond of 1.00 carat and above. The most comprehensive GIA report, including a full clarity plot.

Natural · 1.00ct & over
Laser Inscription Registry
The diamond is laser-inscribed with its unique GIA report number on the girdle.
Shape & Cutting Style
The diamond’s shape (round brilliant, oval, princess, etc.) and cutting style.
Measurements
Precise dimensions in millimetres — length, width and depth.
Carat Weight
Weight to the nearest hundredth of a carat.
Colour Grade
Graded on the D–Z colour scale, from colourless to light yellow.
Clarity Grade
Assessed under 10× magnification on the FL–I3 clarity scale.
Cut Grade
GIA’s overall cut grade — Excellent, Very Good, Good, Fair or Poor.
Depth & Table
Proportions as a percentage of the diamond’s diameter.
Girdle
Range of girdle thickness (the thin band around the widest part of the diamond).
Culet
Appearance of the culet facet (the tiny point at the base of the diamond).
Finish
Grades of polish and symmetry — how well the facets are finished and aligned.
Fluorescence
Colour and strength of fluorescence under long-wave ultraviolet light.
Clarity Plot
A diagram showing the size, type and position of any inclusions under magnification.
Comments
Additional characteristics not covered by standard grading (e.g. internal graining).
The Monroe Yorke Promise

Transparency is not an extra — it’s the baseline.

Our commitment to providing a GIA or IGI certificate with every diamond is central to who we are. It is the proof behind The Monroe Yorke Signature Diamond, and the foundation of our role as your trusted personal jeweller.

It means you can be confident in every aspect of your purchase — its ethical origins, its exceptional quality, and its lasting value — for a lifetime.

Choose your diamond with confidence

Whether you are drawn to the timeless legacy of a natural diamond or the modern brilliance of a lab-grown, every diamond at Monroe Yorke is independently certified and personally selected to meet our Signature standard.

Natural Diamond Rings Lab-Grown Diamond Rings