CBJ Practice Test

The Certified Bench Jeweler (CBJ) credential is offered by Jewelers of America and is open to the industry. This page gathers our free practice sets by topic, walks through sample questions with explanations, summarizes the written and practical exam rules from the official source, and suggests a way to prepare. Our questions are written by us with AI tools and are not real exam questions.

CBJ Exam at a Glance

What changed for CBJ in 2026

• Oct 25, 2026: Delivery changed to Online open-book written exam; practical tests at candidate's own bench (previously Online open-book written exam via proctor; practical tests at candidate's own bench).^[1]

What the CBJ is and how it works

According to Jewelers of America, “To pass the practical bench tests, the candidate must achieve a minimum grade of 75%.”^[1]

The CBJ is a bench certification from Jewelers of America. It is open to the industry, and the exams are also available in Spanish.

The exam has a written part and a practical part. The written exam is delivered online and is open-book. It is timed at 1 hour and must be taken in one sitting. The practical bench tests can be taken at your own bench, using your own tools and equipment.

Scoring uses the same bar for both parts: a minimum of 75% is needed to pass the written and the practical tests.

Fees: registration plus the written exam costs $475 for JA members and $575 for non-members.

Retake rules differ by part. You have 3 attempts at the written test. For the practical test you have a maximum of 2 attempts, and you need to notify JA within 30 days. A retaken practical test means paying for the cost of materials used in that test. Jewelers of America sends practical results within 30 business days of receiving your test.

We could not verify an official list of content areas, so we do not claim one here. Check the Jewelers of America bench certification page for the current outline, fees and rules before you register, since these can change.

Worked examples: how to reason through CBJ questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: You notice flux has become glassy and brown during a soldering operation. This indicates:

1. The flux is exhausted and the joint may oxidize
2. The metal has reached ideal soldering temperature
3. Solder has already flowed through the joint
4. The piece needs to be quenched immediately

Answer: A. The flux is exhausted and the joint may oxidize

Explanation:

The correct answer is that the flux is exhausted and the joint may oxidize. Flux protects the metal from oxygen while it is hot. Once it turns glassy and brown, it has burned off and can no longer do that job, so the surface starts to oxidize and solder may not flow cleanly.

Ideal soldering temperature is not shown by flux colour alone, so that option is wrong. Solder flowing through a joint is seen by watching the solder itself, not by the flux. Quenching immediately is wrong because cooling a piece in that state does not restore the flux and can cause other problems.

Rule to remember: spent flux is a warning sign. Stop, let the piece cool, clean it, and re-flux before heating again.

Example 2

Question: What is the relationship between theory and practice?

1. Theory informs practice, and practice tests and refines theory
2. They are completely separate domains
3. Practice is always more important than theory
4. Theory always takes priority over practical experience

Answer: A. Theory informs practice, and practice tests and refines theory

Explanation:

The correct answer is that theory informs practice, and practice tests and refines theory. Each side feeds the other. Knowing why a metal behaves a certain way helps you choose the right method at the bench, and what you see while working shows where the explanation is incomplete or needs adjusting.

Saying they are completely separate is wrong because the two constantly overlap in real work. Saying practice is always more important, or that theory always takes priority, is wrong because words like always and completely ignore how the two depend on each other.

Rule to remember: on multiple-choice questions, be wary of absolute wording. The balanced, two-way answer is usually the sound one.

Example 3

Question: What is the approximate Mohs hardness range of opal?

1. 5.5–6.5
2. 7–7.5
3. 8–8.5
4. 9–9.5

Answer: A. 5.5–6.5

Explanation:

The correct answer is 5.5–6.5. Opal sits in the middle of the Mohs scale, which makes it softer and easier to scratch than most popular gemstones. It also needs gentler handling in setting and cleaning.

The range 7–7.5 is wrong because that is closer to harder stones such as quartz. The range 8–8.5 is wrong because it describes much harder gems. The range 9–9.5 is wrong because it belongs to the hardest common gem materials, and opal is nowhere near that.

Rule to remember: learn the hardness of the common stones as a rough ladder, then ask whether a stone can survive the wear and the setting method you plan for it.

How to use these practice tests

Start with the official Jewelers of America bench certification page. Read the current rules, then decide when you want to sit the written exam and the practical tests, since they are separate parts.

Next, take one of our practice sets without looking anything up, even though the real written exam is open-book. This shows what you actually know. Good places to begin are Core Knowledge and Fundamentals and Metal Properties and Alloys.

Read every explanation, including for questions you got right. Keep a short list of topics you missed and return to them with the sets on Gemstone and Setting Techniques, Finishing and Polishing and Safety and Compliance.

Because the exam is open-book, practise finding answers quickly in your own reference materials and notes, so the time limit does not catch you out. For the practical part, rehearse at your own bench with the tools you will use. Our questions cannot replace hands-on time with the work.

Sources & last verified

1. Jewelers of America — time limit, passing score, exam fee, retake fee (official source). “The written exam is a one hour timed exam and must be taken in one sitting.” Verified Oct 25, 2026 · source checked Oct 25, 2026.

How we verify: editorial & fact-checking policy. Report an error: contact us.