GIA Diamond Grading and Identification 2

Question 1

On the GIA color grading scale, which letter grade represents a truly colorless diamond?

Accepted Answer

D

Answer

D is the highest color grade on the GIA scale and represents a completely colorless diamond.

Question 2

What does the term 'fluorescence' describe in diamond grading?

Accepted Answer

A diamond's reaction to ultraviolet light

Answer

Fluorescence refers to a diamond's visible light emission when exposed to ultraviolet (UV) radiation.

Question 3

Which diamond inclusion type is described as a tiny crystal of another mineral trapped inside the diamond?

Accepted Answer

Crystal

Answer

A crystal inclusion is a mineral crystal (which may be another diamond or a different mineral) enclosed within the host diamond.

Question 4

GIA's cut grade for standard round brilliant diamonds evaluates which combination of factors?

Accepted Answer

Brightness, fire, and scintillation

Answer

GIA's cut grade assesses the overall face-up appearance through brightness, fire, scintillation, as well as design and craftsmanship.

Question 5

A diamond described as 'SI1' on the GIA clarity scale has inclusions that are:

Accepted Answer

Noticeable under 10x magnification but not to the naked eye

Answer

SI1 (Slightly Included 1) inclusions are noticeable under 10x magnification but typically not visible to the unaided eye.

(GIA) Certified Diamonds Gemological Institute of America Practice Test