Preparing for the CDG exam? A printable CDG practice test PDF lets you review questions, test your knowledge offline, and build the exam readiness that timed, screen-based testing demands. Whether you are studying at home, commuting, or revisiting weak areas on paper, a printed practice test remains one of the most effective preparation formats available. This page provides a free PDF download and a structured study guide for the CDG examination. Practice with the free Certified Diamond Grader practice test on PracticeTestGeeks (9 questions with answer explanations).
The CDG assessment tests candidates on the core competencies required for certification or qualification in the field. A strong preparation strategy combines repeated practice testing with targeted review of areas where accuracy falls below 70%. Use this PDF alongside the online CDG practice tests on this site for the most complete preparation experience — paper for review and annotation, online for timed simulation with instant scoring.
Candidates are tested across the primary knowledge domains that define competency in the CDG field. Each domain contributes a weighted percentage of the total scored questions. High-weight domains deserve proportionally more preparation time. The exam format is typically multiple-choice, and understanding the question structure — identifying the best answer rather than the first correct-sounding one — is as important as content knowledge.
Common high-priority areas include foundational theory, applied practice, regulations or standards governing the field, and scenario-based reasoning that tests judgment under realistic conditions. Review official exam content outlines from the certifying body to confirm current domain weights before your examination date, as content outlines are updated periodically.
Print the PDF, set a timer proportional to the number of questions, and complete each section without reference materials to simulate real exam conditions. After grading, categorize every incorrect answer by domain to build a targeted error log. Prioritize re-study in your weakest domains, then take an additional timed practice session to confirm improvement. Repeat the cycle until accuracy is consistently above 75% across all domains.
Interactive Certified Diamond Grader resources on PracticeTestGeeks, free to start:
Facts verified Oct 22, 2026 against HRD Antwerp. Dates that have passed are removed automatically.
| Item | Detail | Official source |
|---|---|---|
| Number of questions | Two exams: online theory (level 1) + practical (level 2) | HRD Antwerp |
| Exam fee (Online Recorded Theory Module) | $673 excl. 21% VAT (90 days access) | HRD Antwerp |
| Validity | Both modules must be passed within 6 months | HRD Antwerp |
| Delivery | Online theory (live or recorded) + on-campus practical course (10 days) | HRD Antwerp |
| Eligibility | Minimum age 18; no prior diamond experience required | HRD Antwerp |
| Registration deadline | Full payment due within 15 days of registration | HRD Antwerp |
Facts verified Oct 22, 2026 against HRD Antwerp. Dates that have passed are removed automatically.
Before attempting practice tests, ensure you have reviewed the official study materials for the CDG exam. Most certifying bodies publish a candidate handbook or content outline that lists exactly what knowledge is tested. Read this document first — it tells you not only what to study but also what to ignore. Allocate study time in proportion to domain weights: spend more time on high-weight domains and less on domains you already know well.
Once you have reviewed the content, move to practice testing. Each practice test session should be treated as a diagnostic: the questions you answer incorrectly are more valuable than the ones you answer correctly. Keep an error log organized by domain. After three to four practice tests, patterns in your errors will become clear. These patterns tell you exactly where to concentrate additional study effort.
In the week before the CDG exam, focus on review rather than new learning. Take one full-length timed practice test to confirm readiness, then spend the remaining days reviewing your error log and reinforcing the concepts behind your most common mistakes. Avoid cramming new material in the final 48 hours — consolidation of existing knowledge is more valuable at that stage than attempting to add new content.
After completing this PDF, take full online CDG practice tests at CDG practice test — instant scoring with explanations for every answer. Use both formats together: this PDF for offline review and annotation, the online tests for timed simulation with immediate feedback. Together they give you the most complete CDG exam preparation available on a single platform.
Try these questions from our free Certified Diamond Grader practice tests. The correct answer and an explanation follow each question.
Which security measure most effectively reduces the risk of internal theft of high-value diamonds in a grading laboratory?
Answer: B. Requiring dual control—two-person verification for high-value stones
Dual control ensures no single employee has unsupervised access to high-value inventory, creating mutual accountability.
When a client presents a diamond claimed to be 'D Flawless' with a GIA report, what verification step is most critical?
Answer: A. Confirm the laser inscription matches the report number under magnification
Confirming the laser inscription matches the report number ensures the stone and document are a matched pair, which is the most critical verification for high-value stones.
What is the importance of data security in CDG digital applications?
Answer: B. Protecting sensitive information from unauthorized access and breaches is essential
Data security is fundamental in CDG practice, protecting sensitive professional and client information from unauthorized access, breaches, and loss.
What type of luminescence does many gem-quality diamonds exhibit under shortwave UV light?
Answer: C. Fluorescence, often blue or inert
Many diamonds fluoresce blue (or are inert) under shortwave UV, though fluorescence is more commonly tested under longwave UV.