CDG Cheat Sheet 2026

The 30 highest-yield CDG facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. How should an CDG professional handle unexpected results that differ from predictions? → Analyze factors, document findings, and adjust the approach based on what was learned
2. Which clarity characteristic type CANNOT be improved through laser drilling? → White feathers or clouds
3. Per GIA standards, which measurement sequence is recorded first for a round diamond? → Minimum diameter × maximum diameter × depth
4. How should an CDG professional present complex findings to non-experts? → Translate into accessible language, use visuals, and verify understanding
5. Why is polishing important after cutting? → It enhances sparkle
6. What is a common shape for polished diamonds? → Round brilliant
7. How should CDG professionals stay current with regulatory changes? → Actively monitor updates through professional associations and continuing education
8. How should an CDG professional approach a novel situation not covered by standard procedures? → Apply foundational principles, assess risks, consult resources, and document decisions
9. What is the purpose of laser drilling in diamond treatment? → To reach dark inclusions and remove or bleach them
10. Which grading report is widely accepted for diamond certification? → GIA report
11. Which mineral is the hardest known natural material? → Diamond
12. On the Rapaport price sheet, how are diamonds organized? → By carat weight range, then color grade, then clarity grade
13. How long should a professional diamond grading laboratory typically retain grading records in the US? → At minimum 7 years, in line with standard business record-keeping practices
14. How do CDG professionals establish measurable quality objectives? → Defining specific, measurable, achievable, relevant, and time-bound targets
15. What is reflective practice in Certified Diamond Grader professional growth? → Systematically examining experiences to gain insight and improve future practice
16. Which organization requires disclosure of fracture filling and will not grade treated diamonds on standard reports? → GIA (Gemological Institute of America)
17. How do CDG professionals effectively transfer training knowledge to workplace practice? → Through supervised practice, mentoring, and progressive independence with feedback
18. How should CDG professionals evaluate new technology tools? → Assess functionality, reliability, security, and alignment with professional needs
19. What is the primary consumer safety concern with certain irradiation treatment methods? → Residual radioactivity in some treatment methods
20. What tool is commonly used to cut diamonds? → Diamond saws
21. Among the 4Cs, which factor typically has the greatest influence on a diamond's per-carat price at higher quality levels? → Color grade
22. What is the first step in risk assessment for Certified Diamond Grader professionals? → Identifying potential hazards and vulnerabilities in the specific context
23. What substance is most commonly used in fracture filling of diamonds? → Lead glass (high lead-content glass)
24. What distinguishes quality assurance from quality control in Certified Diamond Grader practice? → QA prevents defects through process design while QC detects defects through inspection
25. What is the primary competency framework for Certified Diamond Grader professionals? → Structured competency standards defined by the certifying body
26. How has digital technology transformed Certified Diamond Grader practice? → It has enhanced data management, communication, and operational efficiency
27. A fancy shape diamond (e.g., pear or marquise) is typically priced relative to a round brilliant of the same weight and quality grade in which way? → At a discount, because round brilliants are more popular and have greater market demand
28. What is the benefit of interdisciplinary collaboration in Certified Diamond Grader practice? → It brings diverse expertise and perspectives that improve outcomes
29. Which of the following is the most telltale sign of fracture filling when viewed under magnification? → Rainbow flash effect (iridescent color flash)
30. What is the role of internal audits in Certified Diamond Grader compliance management? → They verify adherence to regulations and identify areas needing improvement