CDG Diamond Grading & Evaluation Techniques

Question 1

What is the '4 Cs' in diamond grading?

Accepted Answer

Cut, Color, Clarity, Carat

Answer

The '4 Cs' are the universal standard for evaluating the quality and value of a diamond. They stand for Cut, Color, Clarity, and Carat weight, each playing a crucial role in determining a diamond's overall beauty and rarity.

Question 2

What does diamond 'cut' quality affect?

Accepted Answer

Its brilliance and sparkle

Answer

Diamond 'cut' quality refers to how well a diamond's facets interact with light, not its shape. An excellent cut maximizes a diamond's brilliance (white light reflection), fire (dispersion of light into colors), and scintillation (sparkle), making it the most critical factor for a diamond's visual appeal.

Question 3

How is diamond color graded?

Accepted Answer

From D to Z

Answer

Diamond color is graded on a scale from D to Z, where D represents a completely colorless diamond and Z indicates a diamond with a noticeable light yellow or brown tint. Colorless diamonds (D-F) are the rarest and most valuable, as they allow the most light to pass through and reflect as sparkle.

Question 4

What is diamond clarity concerned with?

Accepted Answer

Inclusions and blemishes

Answer

Diamond clarity is concerned with the presence and visibility of internal characteristics called inclusions, and external characteristics called blemishes. These natural imperfections are evaluated under 10x magnification, with fewer and less noticeable inclusions resulting in a higher clarity grade and greater value.

Question 5

What does carat weight measure?

Accepted Answer

Size or weight of the diamond

Answer

Carat weight is the standard unit of measurement for a diamond's weight, with one carat equaling 200 milligrams. While it primarily measures weight, a larger carat weight generally correlates with a larger diamond size, making it a significant factor in a diamond's perceived value and rarity.

(CDG) Certified Diamond Grader Practice Test

(CDG) Certified Diamond Grader Practice Test

CDG Diamond Grading & Evaluation Techniques