Services

Diamond Grading

Two diamonds can share the same shape and weight while differing in color, clarity, proportions, and appearance. Diamond grading provides a structured way to describe these characteristics, making the differences easier to understand.

IDGL diamond grading helps turn those observations into report information that can be reviewed and discussed. A grading report is a reference for the examined diamond within the stated service scope. It should be read together with its comments and identifying details.

What diamond grading describes

The familiar 4Cs - carat weight, color, clarity, and cut - provide a starting framework for diamond quality. They describe different characteristics rather than a single measure of how desirable a diamond is to every person.

Carat weight records mass. Color describes the relevant color assessment. Clarity addresses internal and surface characteristics under the applicable grading conditions. Cut assessment concerns design and craftsmanship within the laboratory's defined system; the availability of an overall cut grade depends on the report product and shape.

The details beyond the 4Cs

Measurements, shape, cutting style, polish, symmetry, and comments can help explain the stone more fully. An inscription or clarity diagram, where included, may provide additional identifying information.

Not every report product contains the same fields. Before submitting, confirm which characteristics will be examined and reported for your diamond.

Why a report matters

A report gives the parties in a conversation a shared written reference. A buyer can compare the reported characteristics of several stones. An owner can retain a record alongside purchase documents. A jeweler can explain the item using the terminology found in its report.

The document does not choose a diamond for you. Personal preference, appearance, design, and the purpose of the purchase still matter.

Loose and mounted diamonds

The condition in which a diamond is submitted can affect the examination. A setting may restrict access to parts of the stone, and some information may need to be expressed as an estimate, range, or limitation.

Tell IDGL whether your diamond is loose or mounted before requesting a service. Do not remove a stone yourself simply to prepare an enquiry.

Preparing for grading

Provide the approximate weight if known, the shape, mounting status, and any existing report. Mention known treatments, recutting, repairs, or damage. Explain whether you are documenting the diamond, reviewing a purchase, or seeking clarification of earlier information.

Contact IDGL to confirm the suitable report, eligibility, current fee, and submission arrangements for your diamond.