GIA Certification Standards & Documentation 4

Question 1

What is the primary purpose of the plotting diagram included on a GIA Diamond Grading Report?

Accepted Answer

To map the location and nature of clarity characteristics

Answer

The plotting diagram is a map of the diamond that shows the type and location of clarity characteristics used to assign the clarity grade.

Question 2

According to GIA documentation standards, which symbol on a plotting diagram represents an included crystal?

Accepted Answer

A red dot or outlined shape

Answer

GIA uses red symbols to denote internal characteristics; an included crystal is typically shown as a small outlined shape or dot in red.

Question 3

A client submits a diamond with a previous GIA report. Which GIA service allows graders to reassess the stone without issuing an entirely new report number?

Accepted Answer

There is no such service; a new report number is always issued

Answer

GIA always assigns a new report number upon re-submission; there is no service to update a grade while retaining the original report number.

Question 4

What does the 'depth percentage' on a GIA Diamond Grading Report measure?

Accepted Answer

The total depth from table to culet as a percentage of average girdle diameter

Answer

Depth percentage is the total depth of the diamond (table to culet) divided by the average girdle diameter, expressed as a percentage.

Question 5

On a GIA report, the term 'Very Good' under symmetry indicates what about the diamond's facet arrangement?

Accepted Answer

Minor deviations that are difficult to observe under 10x magnification

Answer

A 'Very Good' symmetry grade means any deviations from ideal symmetry are difficult to detect even under 10x magnification.

(GIA) Certified Diamonds Gemological Institute of America Practice Test

(GIA) Certified Diamonds Gemological Institute of America Practice Test

GIA Certification Standards & Documentation 4