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

To certify the authenticity of individual diamonds

Answer

To document a diamond's chain of custody from mine to market

Answer

To list retail prices for finished jewelry pieces containing diamonds

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

Cut grade

Answer

Clarity grade

Answer

Carat weight

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

It increases the price by 5–15% due to enhanced visual appeal

Answer

It has no measurable effect on price for top-color diamonds

Answer

It increases the price only for stones graded VS2 or better

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

A diamond that has been treated to improve its color

Answer

A diamond whose grading report has been issued by a non-recognized laboratory

Answer

A diamond that has been re-cut from a larger rough stone

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 these weights are automatically assigned a higher clarity grade

Answer

These weights correspond to minimum size requirements for GIA grading reports

Answer

Diamonds at these weights qualify for free laser inscription

Question 6

Why does the per-carat price of diamonds generally increase as carat weight increases within the same quality tier?

Accepted Answer

Large rough crystals suitable for bigger polished stones are rarer, increasing their per-carat scarcity premium

Answer

Larger diamonds are always cut with better proportions

Answer

The cost of grading reports scales linearly with diamond size

Answer

Larger diamonds always receive higher color grades due to greater light dispersion

Question 7

Which grading laboratory's reports typically command the highest price premium in the wholesale diamond market?

Accepted Answer

GIA (Gemological Institute of America)

Answer

IGI (International Gemological Institute)

Answer

EGL (European Gemological Laboratory)

Answer

HRD (Hoge Raad voor Diamant)