CDG CDG Laboratory Grading Reports & Documentation 1 — Questions and Answers
Question 1: On a GIA Diamond Grading Report, which of the following is NOT included?
- The diamond's purchase price or market value (Correct answer)
- The diamond's measurements
- The clarity grade
- The cut grade (for round brilliants)
Correct answer: The diamond's purchase price or market value
GIA grading reports do not include monetary value, as GIA is a grading laboratory — not an appraisal service — and valuation is the role of a separate appraiser.
Question 2: The AGS cut grading scale uses which numerical system?
- 0 to 10, with 0 being Ideal (Correct answer)
- 1 to 5, with 1 being Excellent
- A to F, with A being the best
- 10 to 100, with 100 being Ideal
Correct answer: 0 to 10, with 0 being Ideal
AGS uses a 0–10 scale where 0 represents the Ideal cut grade and 10 represents Poor — counterintuitively, the lowest number is the highest quality.
Question 3: What does the 'plot' on a GIA grading report indicate?
- A diagram showing the location and type of clarity characteristics (Correct answer)
- The diamond's proportions and angles
- The grading laboratory's authentication mark
- The diamond's fluorescence pattern
Correct answer: A diagram showing the location and type of clarity characteristics
The plot is a diagram of the diamond showing the location, type, and relative size of all clarity characteristics observed during grading.
Question 4: On a GIA report, what does a 'VS1' clarity grade mean?
- Very Slightly Included — minor inclusions difficult to see under 10x magnification (Correct answer)
- Very Superior — first grade above Flawless
- Verified Stone — first quality assessment
- Very Small Inclusions — visible to the naked eye
Correct answer: Very Slightly Included — minor inclusions difficult to see under 10x magnification
VS1 (Very Slightly Included 1) means the diamond has minor inclusions that are difficult to detect under 10x magnification by a skilled grader.
Question 5: Which feature on modern GIA reports allows a recipient to verify the report's authenticity online?
- A hologram and QR code linked to GIA's Report Check system (Correct answer)
- The grader's handwritten signature on the back
- The laboratory director's embossed stamp
- A serial number engraved on the table facet
Correct answer: A hologram and QR code linked to GIA's Report Check system
GIA reports include a hologram and QR code that connect to GIA's online Report Check, allowing instant digital authentication of any report.
Question 6: What information does the 'fluorescence' section of a GIA report provide?
- The diamond's fluorescence intensity and color under long-wave UV light (Correct answer)
- The diamond's phosphorescence duration
- The chemical composition causing fluorescence
- The fluorescence response under both long and short-wave UV
Correct answer: The diamond's fluorescence intensity and color under long-wave UV light
GIA reports note fluorescence intensity (None through Very Strong) and color under long-wave UV, which can influence the diamond's appearance and market value.
CDG CDG Laboratory Grading Reports & Documentation 1
On a GIA Diamond Grading Report, which of the following is NOT included?