Why an Independent Report Matters More Than a Brand Name

A grading report from an independent laboratory describes your stone against a consistent standard. Why that matters more than who sold it to you.

A diamond is not a commodity you can price by weight alone. Two stones of identical carat can differ in value by a multiple, and the difference is often invisible to an untrained eye.

That is the entire reason grading reports exist.

What a report is

A description of one specific stone, produced by a laboratory that grades to a consistent standard, by graders who do not know who owns the stone and have no interest in the sale.

That independence is the product. Not the paper.

Independent means not the seller

A report issued by the party selling the stone is not an independent assessment, however handsome the document. This is not an accusation of dishonesty, it is a structural conflict, and it is exactly why third-party laboratories exist.

Look for a report from a laboratory that grades stones as its business, not as a service attached to a sale.

Consistency is the real value

The value of a standard is that a grade means the same thing everywhere. A stone graded to a consistent standard in one country can be compared to one graded in another.

Where laboratories differ in strictness, comparison breaks down. Two stones with identical stated grades from different laboratories may not be equivalent, and the price difference between them is usually the market telling you so.

If a stone is priced well below comparable stones with the same stated grades, the explanation is usually the report.

What to check on any report

The number matches the stone. Most graded stones carry a laser inscription on the girdle. Ask to see it under magnification. This ties the paper to the object, which is the whole point.

The date. Standards and the stone's condition both change. A twenty-year-old report describes the stone as it was.

The comments section. Small type, bottom of the page, and it can materially change what you are buying, treatments, additional characteristics, anything not shown in the plot.

Whether it is a full report or a summary. Shorter documents omit detail, particularly plotted inclusions.

What a report does not do

It does not tell you the stone is beautiful. Two stones with identical grades can perform very differently, particularly in fancy shapes where no overall cut grade is issued.

It does not state a value. That is an appraisal, and it is a different document for a different purpose.

Our position

We will show you the report before you ask, show you the inscription, and explain what is on it including the parts that are unflattering.

A jeweller comfortable being checked is telling you something. So is one who is not.

Frequently asked questions

Do I need a report for every diamond?

For anything of significance, yes. Below roughly 0.3ct it is less common.

Are all laboratories equally strict?

No, and the market prices that difference.

Is a report the same as an appraisal?

No. A report describes; an appraisal values.

Can a report be faked?

Documents can. Check the number against the laboratory's online database.

Book a complimentary design consultation at the C'Garden atelier, The MET Corporate Towers, Kuala Lumpur: 010-766 7448 · hq@cgarden.com.my

C'Garden is an independent bespoke jeweller in Kuala Lumpur. We are not affiliated with, endorsed by, sponsored by or certified by any organisation, laboratory or brand named in this article. Third-party names are used only to refer factually to those organisations and their published standards. All text and imagery in this article is original work created by C'Garden.

Reference

Jewelers of America. (n.d.). Diamond grading reports. Jewelers of America. https://www.jewelers.org/buying-jewelry/jewelry-buying-guides/diamond-buying-guide/diamond-grading-reports