CDG Diamond Pricing & Valuation

Question 1

What is the primary purpose of the Rapaport Diamond Report (Rap Sheet)?

Accepted Answer

To provide a standardized wholesale price benchmark for round brilliant diamonds by size and grade

Answer

The Rapaport Diamond Report is a widely used weekly price list that serves as a benchmark for wholesale diamond prices organized by carat weight, color, and clarity grade.

Question 2

Among the 4Cs, which factor typically has the greatest influence on a diamond's per-carat price at higher quality levels?

Accepted Answer

Color grade

Answer

At higher quality tiers, color grade tends to have the most dramatic impact on per-carat price because D–F colorless diamonds command significant premiums over near-colorless grades.

Question 3

How does strong blue fluorescence typically affect the price of a D–F color, high-clarity diamond?

Accepted Answer

It decreases the price because it can cause a hazy or oily appearance in some stones

Answer

Strong blue fluorescence in D–F color diamonds is generally considered a negative factor because it can produce a hazy or milky appearance, reducing the stone's value.

Question 4

In diamond trading, what does the term 'off-make' refer to?

Accepted Answer

A diamond with proportions that deviate significantly from ideal cutting standards

Answer

An 'off-make' diamond has proportions outside accepted cutting standards—such as excessive depth or poor symmetry—resulting in a discount from Rapaport prices.

Question 5

What pricing phenomenon occurs at 'magic sizes' such as 0.50 ct, 1.00 ct, and 2.00 ct?

Accepted Answer

Diamonds just below these weights sell at a discount, while diamonds at or above them command a premium

Answer

Diamonds at or just above 'magic sizes' command higher per-carat prices due to strong consumer demand for milestone weights, while stones just below are often discounted.

(CDG) Certified Diamond Grader Practice Test

(CDG) Certified Diamond Grader Practice Test

CDG Diamond Pricing & Valuation