GRC Certified Aquamarines: How to Read Your Gemstone Report

Lab Notes · Certification

A pale blue stone could be aquamarine, blue topaz, glass or a synthetic imitation. Telling them apart is a laboratory’s job, and the report it issues is your record of what it found. This guide walks through a GRC aquamarine report, field by field, and explains what the report can and cannot tell you about heating and “Santa Maria” color.

The laboratory behind the paper

GRC is short for Gem Research Center, which describes itself as an independent gemological research laboratory. Its reports are the documents that travel with DANFÉE’s natural aquamarine jewelry, confirming the identity and natural origin of each stone.

What happens before a report is written

Aquamarine is a variety of the mineral beryl. A laboratory confirms this with several kinds of evidence, each answering a narrower question.

A simplified view of typical gemological testing stages. Exact methods depend on the stone and the laboratory.

These measurements matter because aquamarine’s look-alikes behave differently. Glass and synthetic spinel are singly refractive, while aquamarine is doubly refractive. Blue topaz, usually colorless topaz treated to turn blue, can look very similar to the eye but can be separated by testing. The result is a clear answer to the first question any buyer has: is this really aquamarine?

Reading the report, one field at a time

An illustrative layout for orientation only. Field names and positions on your GRC report may differ.

1. Identification. Start here. You are looking for the word natural alongside aquamarine or beryl. If the stone were an imitation or laboratory-grown, this is where the report would say so.
2. Measurements. Carat weight, shape, cutting style and dimensions. These let you match the paper to the jewelry in your hand. On a pair of earrings, check whether the document covers each stone or the pair.
3. Comments. Read this line word for word. Any stated treatment or additional finding will usually be here.
4. Photograph. A picture of the tested item, useful for a quick visual comparison.
5. Color. The laboratory’s description of what it observed. Color terms are not standardized across laboratories, so read them as this lab’s wording rather than a universal grade.
6. Report number. Your key for checking the record later.

Natural is one question. Heated is another.

This is where aquamarine differs most from sapphire. Many aquamarines are heated at relatively low temperatures to remove a greenish tone and leave a purer blue. The result is considered stable, but the process often leaves no evidence that standard testing can detect. So a report can confirm that a stone is natural without being able to prove that it was never heated.

How formation and treatment combine. A simplified overview to help you interpret report wording.

What about “Santa Maria”?

“Santa Maria” comes from the Santa Maria de Itabira mine in Brazil, but in today’s trade it mainly describes a color: a saturated, pure blue. NGTC, for example, has stated that the name carries no origin meaning in commercial use, and that its certificates note in the remarks whether a stone reaches its “Santa Maria” color range. AIGS likewise judges the term by appearance rather than locality.

Laboratories set their own criteria, and a color term from one is not a universal grade. When you read your report, keep these two points in mind:

• Color is not origin. A “Santa Maria” color does not by itself mean that a stone came from that mine, or even from Brazil. Origin is a separate statement.
• Our scale and the lab’s wording are separate. The color and clarity shown on a DANFÉE product page, such as Santa Maria Blue or Eye-Clean, are our product descriptions. The report records the laboratory’s own wording. If you want to compare the two, ask us and we will go through them with you.

Checking that your report is genuine

1. Locate the report number on your GRC document.
2. Open our certificate verification page and follow the GRC link to the laboratory’s lookup.
3. Confirm that the identification, weight, shape and measurements in the record match your paper.
4. Compare the photograph with your jewelry.

If anything does not line up, get in touch with us before you have the piece altered or reset, so it can be checked while it is still in its original condition.

Where a report stops

A report answers what a stone is. It does not say what it is worth, what it will be worth in future or what it should be insured for; those are separate services. Nor can it describe the things you will notice every day, such as how the blue looks indoors at night or how the setting catches the light. Treat the report as the factual foundation, and your own eye as the final judge.

Keep the original with your receipt, store a photo of it somewhere safe, and bring it along whenever the jewelry is serviced or handed down. For help choosing a stone, read How to Choose an Aquamarine.

Quick answers

Sources: Gem Research Center · GIA, Does GIA grade aquamarine? · GIA, Aquamarine Description · NGTC, Santa Maria Aquamarine Notice · AIGS Santa Maria color assessment · LibreTexts, Aquamarine · International Gem Society, Distinguishing Aquamarine Imitations. Illustrations by DANFÉE are simplified for education and do not reproduce an actual GRC report.