CDG Professional Standards & Competencies 4

Question 1

When a laboratory's grading result differs from a GIA report on the same stone, the laboratory should:

Accepted Answer

Investigate potential grader error but stand by results if the independent assessment was properly conducted

Answer

Reputable laboratories investigate discrepancies but maintain professional independence; genuine differences in assessment can exist between laboratories.

Question 2

Which lighting condition is the industry standard for color grading diamonds?

Accepted Answer

Controlled daylight-equivalent fluorescent lighting at approximately 6500K

Answer

Daylight-equivalent fluorescent lighting at ~6500K is the standardized environment for accurate, consistent color assessment.

Question 3

A diamond grader identifies a stone as likely laboratory-grown rather than natural. The grader's professional responsibility is to:

Accepted Answer

Document the observation, conduct confirmatory testing, and disclose on the report

Answer

Suspected laboratory-grown origin requires confirmatory testing and mandatory disclosure, as origin has significant impact on value and consumer rights.

Question 4

Professional graders are required to maintain arm's-length relationships with clients primarily to:

Accepted Answer

Ensure grading objectivity is not compromised by personal or financial relationships

Answer

Arm's-length relationships preserve grading objectivity by preventing personal or financial interests from influencing grade assignments.

Question 5

In a professional grading environment, the 'blind grading' protocol means:

Accepted Answer

Each grader assesses a stone without seeing prior graders' results

Answer

Blind grading prevents anchoring bias by ensuring each grader forms an independent opinion before comparing results with colleagues.

(CDG) Certified Diamond Grader Practice Test

(CDG) Certified Diamond Grader Practice Test

CDG Professional Standards & Competencies 4