CGA Cheat Sheet 2026: One-Page Review of Must-Know Facts

What This Cheat Sheet Covers (and What It Can't)

This is a one-page-style review of the facts that matter most for the Certified Gemologist Appraiser credential. It is organized so you can scan it the week before you start your exam window and again the day before. Where AGS has not published a detail, this sheet says so plainly instead of guessing. For a candidate preparing to appraise gems and jewelry professionally, knowing what is confirmed and what must be verified is itself part of good appraisal practice.

If you are new to the credential, start with What Is CGA Certification? for the big picture, then return here for the compressed facts. When you are ready to drill, the CGA practice tests let you apply this material to realistic questions.

Identity: Who Issues the Credential

• Credential: Certified Gemologist Appraiser (CGA).
• Issuing body: American Gem Society (AGS).
• Delivery: AGS-controlled online initial examinations. The external testing or proctoring vendor, if any, is not publicly identified.
• Digital badge: AGS issues a Credly badge for the credential.

CGA is an AGS credential, which is why membership context matters so much. It is not a generic appraisal designation open to anyone; it sits inside the AGS membership structure. If you are still sorting out the terminology, What Does CGA Stand For? and CGA Meaning cover the naming question in more depth.

Eligibility Snapshot

Eligibility is the first gate, and it is stricter than many candidates expect. Based on the current AGS pages, an applicant must:

1. Already be an AGS Certified Gemologist.
2. Complete approved appraisal education.
3. Complete color-vision testing.
4. Agree to applicable approved appraisal and report standards.
5. Be employed at an AGS member business.

On August 6, 2026, AGS announced updated requirements that replace the former Appraisals I and II prerequisite with approved external foundational appraisal education. The current AGS qualifying-education page explicitly accepts ASA GJ201 plus GJ202, among other routes. That is one approved path, not the only one, and taking ASA coursework does not make CGA equivalent to an ASA credential. For the full eligibility walkthrough, see CGA Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Fee and Access Mechanics

Two mechanics deserve a second look. First, the fee is nonrefundable and nontransferable, so you cannot hand your seat to a colleague if your schedule collapses. Second, expired access requires repurchase, which means a missed window can cost you the full fee again. Budget your calendar around the shorter of the two published windows until AGS tells you otherwise. The broader pricing picture, including recertification costs, is covered in CGA Certification Cost 2026: Complete Pricing Breakdown.

The Two-Part Exam Structure

The initial CGA process has two components:

• A theory examination covering the knowledge side of appraising gems and jewelry.
• A practical appraisal-report-writing examination, where you demonstrate that you can actually develop and write an appraisal report.

The practical component is what separates this credential from a pure knowledge test. You are not only recalling definitions; you are showing that you can produce a report that meets professional standards. That is why the preparation categories below lean heavily on report development and not just vocabulary. For help gauging the challenge, see How Hard Is the CGA Exam? Complete Difficulty Guide 2026.

What Is Not Publicly Verified

A trustworthy cheat sheet lists its blind spots. As of the September 30, 2026 review of public sources, the following initial-exam details are not publicly verified:

• Actual question or task counts, and the scored versus unscored split.
• The response format for the theory examination.
• Timed-component limits.
• The initial passing threshold.
• Calculator, open-book, adaptive, and proctoring rules for the initial exam.
• A dated 2026 weighted blueprint, including the domain count and which domain carries the most weight.
• The initial pass rate, which AGS does not disclose.

The practical consequence: do not build your study plan around an assumed question count or time limit. Build it around mastering the content areas below and confirm format details with AGS when you receive your exam access instructions.

GJ201 Review: Core Principles of Valuation

The two preparation categories on this site map to the ASA GJ201 and GJ202 courses, which are one current AGS-approved prerequisite route. They give you unweighted study categories, not an official weighted blueprint. Treat them as a sensible way to organize your review, and read CGA Exam Domains 2026: Complete Guide to All 2 Content Areas for how they fit together.

Memory hooks for GJ201

Think of GJ201 as answering the question "what is the job, and who is it for?" Before you can value anything, you must know who your client and intended users are, what definition of value applies, and which market level you are working in. A common trap is treating value as a single number rather than a concept that changes with the definition and the market. When you review, practice stating, for any scenario, the intended user, the intended use, the definition of value, and the relevant market level, in that order.

The three approaches to valuation are a core recurring idea. Make sure you can explain when each approach is appropriate and why you might favor one over another for a particular property type. The ethics material is also high value: competency, privacy, and appraiser responsibility show up as judgment calls, so rehearse how you would handle a client request that crosses a professional line.

GJ202 Review: Insurance Scheduling Appraisals

Why GJ202 matters for the practical exam

Because CGA includes a practical appraisal-report-writing examination, GJ202's emphasis on narrative reports is your best preview of the skills being tested. In the course itself, students construct or modify an appraisal report for a single item of jewelry to show competency. That is exactly the muscle the practical component exercises: take one item, rank its relevant characteristics, research comparable data, reconcile it, and write a coherent report that meets professional standards.

Drill the sequence rather than isolated facts. Identify the property and its characteristics, choose and justify the approach, gather and reconcile data, state the conclusion, and document everything the report requires. Reports fail on missing or inconsistent elements more often than on a single wrong number, so build a personal checklist of required report elements and practice against it.

Recertification Rules at a Glance

Renewal is a different animal from the initial exam. It is open book and untimed with a 75% pass mark, and AGS may also request an appraisal-report review. Keep copies of your work, because a report review means your actual appraisal output can be examined after you are certified. If you earned your credential on or after December 1, 2025, your first renewal falls in 2027, so the 2026 deadline does not apply to you. Long-term considerations like these feed into the question of whether the CGA certification is worth it, and you can compare earning potential in the CGA Salary Guide 2026.

A CGA-Specific Study Sequence

Generic schedules are not very useful here, so this one is tied directly to the two categories and the two exam parts. Adjust it to fit your access window, and remember that a short completion window (two or three weeks) leaves little room for starting from zero. Do the heavy foundation work before you launch the exam. The CGA Study Guide 2026 expands on this, and CGA Training covers learning resources.

Schedule GJ201 first because its vocabulary and framework underpin GJ202, exactly as the courses themselves are sequenced. Then practice reports repeatedly, since the practical exam rewards fluency. Use the CGA practice tests to check that you can move between conceptual questions and report-oriented scenarios without losing the thread.

Frequently Asked Questions

For related reading on careers, see CGA Jobs, and for a refresher on the basics, What Does CGA Mean? and CGA Certification are good places to start.