Each and every diamond is unique and has parameters that are both subjective (color, clarity, polish, etc.) and objective (carat weight, dimensions, etc.). A gemological grading laboratory or institute analyzes and evaluates all the characteristics of a diamond using various tests and equipment. After verifying all the information, a report is created unique to that particular diamond. This document is commonly referred to as a dossier, certificate or report.

This document details the pertinent information about the diamond such as: carat weight, shape, clarity, color, measurements, proportions, finish and origin.

Independently Certified

We strive to provide the most accurate information for each of our diamonds. Every diamond of 0.30 carats and larger is independently graded by one of the major gemological laboratories - European Gemological Laboratory (EGL USA), Gemological Institute of America (GIA) and International Gemological Institute (IGI). Currently American Gem Society (AGS) does not grade synthetic diamonds.

By default, we render services of EGL USA to grade our diamonds. On a customer's request, we can provide a grading report done by GIA, IGI or any other major gemological laboratory that grades lab-grown diamonds.

Sample Certificates

Below you can see a sample certificate for a 1.10ct round yellow diamond from both EGL and GIA to see the detail and differences:
Example EGL Colored Diamond Analysis Report Example GIA Synthetic Colored Diamond Grading Report
We provide all the relevant details and measurements for each of our certified diamonds online. All details can be verified through EGL's online results. GIA does have an online lookup, but this service does not include synthetic diamonds. Contact us and we can email you a scan of any report.

Laser Inscription

Magnification of a laser inscription
As part of the grading process, all diamonds .30cts and larger are laser inscribed "AOTC CREATED", along with the grading report number for full disclosure. This inscription is not visible with the naked eye and does not affect the appearance or clarity of the diamond. It can be read with 10x or more powerful magnification.