MGA Passing Score 2026: Exactly What You Need to Pass

The Number: 90% on the GJ210 Kit

If you searched for the Master Gemologist Appraiser passing score expecting a scaled number or a percentage of multiple-choice questions, the real answer is more interesting. Under the American Society of Appraisers (ASA) September 2026 Master Gemologist Appraiser Certification Program Requirements, the GJ210 Gemology Practicum is a hands-on test kit of 20 loose and mounted gem materials, and the passing criterion is 90%.

That is a high bar, and it is applied to practical identification and grading work performed with your own laboratory equipment. It is not a recall test. This article explains how that 90% is built, where points are won and lost, and how to prepare around the scoring rules. For the full credential picture, see our guide to MGA requirements, eligibility and prerequisites.

What Actually Gets Scored

The GJ210 practicum is one component of the MGA program. The program also includes the GJ209 connoisseurship education component and an appraisal report. The 90% criterion applies to the practicum kit. The report is reviewed against reporting requirements rather than converted into a percentage score, and GJ209 is satisfied through course completion or its documented alternative.

Within the kit, three categories of material are handled differently:

The document does not publish an exhaustive blueprint of which materials appear in a given kit, so treat the categories above as the scoring logic rather than a list of what you will receive.

Colored Stones: Two Conditions per Specimen

For colored stones, partial answers do not earn partial credit in the way many candidates assume. Credit requires correct identification of both:

• Nature: natural, synthetic, manufactured, composite or assembled.
• Mineral species or material composition: what the stone actually is.

This means a correct species with the wrong nature call, such as naming a flux-grown synthetic as a natural stone of the right species, fails the specimen. The reverse also holds. Mounted pieces add difficulty because settings can limit your access to the stone, so your testing sequence matters. Composite and assembled materials in particular reward systematic observation under magnification before you commit to a conclusion.

The program advises standard and advanced gemological testing practice and using multiple techniques. Build the habit of confirming each conclusion with more than one independent observation. Our MGA study guide covers how to structure that preparation.

Diamond Scoring: Five Points and Half-Point Deductions

Diamonds are where the arithmetic is most explicit. For D-Z diamonds, the requirements assign five points per diamond. The grading conditions work in stages:

1. Identity: you must correctly identify the material as diamond.
2. Nature: you must correctly determine natural versus synthetic.
3. Grades: only once those two conditions are met, color and clarity must fall within one grade of the reference. Each color or clarity grading error then costs a half point.

A diamond with correct identity and nature but an off-by-more-than-one-grade call on both color and clarity therefore loses a full point of its five. A missed identity or nature call is more damaging because it prevents the grading conditions from being satisfied at all. The practical lesson: protect the identity and nature calls first, then spend your remaining effort on disciplined color and clarity grading.

Fancy-colored diamonds are simpler on paper. They require correct diamond identity and nature, and their color and clarity are not graded in this practicum. That makes them relatively forgiving in scoring terms but not in detection terms, since synthetic and treated fancy-colored diamonds can be demanding.

Timing, Returns and Extensions

The practicum is not a timed sitting in a testing center. Testing must be completed and the kit returned within four calendar days of receipt, or by the following Monday if you receive it on a Friday. This is a completion and return window, not a continuous 96-hour exam, so you manage your own working sessions inside it.

Any extension requires advance approval from the Chair of the GJ Education Committee. Do not assume flexibility after the fact. If a laboratory problem, illness or shipping issue threatens your window, seek approval before the deadline passes. Plan your calendar so that the days you receive the kit are genuinely clear. Our overview of MGA exam dates and scheduling covers how to think about timing around the broader application.

Your equipment, your responsibility

Candidates may use their own laboratory equipment but must perform identifications personally, without outside assistance. This pairs with the program's laboratory access requirement: you need compliant access to gemological equipment. The September document links laboratory standards to the Accredited Gemologists Association's current Accredited Gem Laboratory minimums, though AGA membership is not required, and it includes a July 2025 equipment list. Because that list can change, check the current minimums rather than relying on an older copy. Confirm that every instrument works and is calibrated before the kit arrives, not after.

The Preliminary Grading Option

One feature that sets this practicum apart from a typical exam: one preliminary grading may confirm whether a passing score has been achieved without identifying erroneous stones. In other words, you can find out whether you have reached the 90% criterion without being told which specimens you missed.

Keep contemporaneous notes for every specimen: which tests you ran, what you observed and why you reached your conclusion. If you need to revisit uncertain stones, those notes show you where your reasoning was thinnest.

What Happens If You Fall Short

The consequences of a below-threshold result are specific:

• A final result below 90% requires another kit.
• Two consecutive failures require resubmission of the entire MGA application.

That second rule raises the stakes of the second attempt considerably. It means your first failure should drive a genuine diagnosis of what went wrong, whether it was nature determinations, borderline diamond grades, mounted-stone access or time management inside the return window. For a realistic view of the difficulty, see how hard the MGA exam is. No current official cohort pass rate was located, so discussion of the MGA pass rate should treat third-party percentages with caution.

The Appraisal Report Has Its Own Bar

The 90% criterion does not cover the appraisal report. The current MGA report covers two items: one plotted diamond, plus either an important colored-gemstone item or a vintage, antique or period item, prepared for a federal-tax intended use. It must meet current ASA-GJ reporting requirements and applicable appraisal standards and assignment requirements.

Instead of a numeric score, the report is judged on compliance. A noncompliant report must be corrected and resubmitted within 30 days. Missing that deadline, or failing to meet reporting requirements after three attempts, rejects the application. A few practical details:

• The report may be prepared specifically for the program, or an actual client report may be used if fully redacted of personally identifying information.
• Simultaneous ASA/MGA applicants do not submit an additional separate MGA report, though the ASA application's own report requirements still apply.
• Applicants who do no appraisal work in North America follow IVS or comparable recognized country standards and discuss an appropriate regulated intended use with the GJ Board of Examiners vice-chair.

These descriptive-element headings are program preparation and report competencies. They are not weighted exam domains, and the requirements do not publish percentage weights. For a topic-by-topic walkthrough, read our guide to all 15 MGA content areas.

Passing Score Myths to Ignore

Search results for MGA are crowded with material that confuses candidates. Several common claims do not match the issuer's current requirements:

The historical GJ210 event page described a three-hour sitting and a one-item report with review rather than pass/fail grading. Those details belong to a closed September 30, 2023 event and should not be mixed with the current kit protocol. Always anchor your plan to the September 2026 requirements document.

Mapping Your Preparation to the Scoring

Generic study routines matter far less here than aligning practice with how points are actually awarded. A sensible sequence, built around the scoring logic above, looks like this:

Beyond the practicum, schedule report drafting early, since the 30-day correction window and three-attempt limit leave little room for a rushed first draft. Cost planning is a separate question; our MGA certification cost breakdown separates verified fee context from what remains unpublished, and you can use the MGA Exam Prep practice test site to reinforce the underlying gemological concepts, keeping in mind that practice questions are not the official practical assessment format.

Frequently Asked Questions