DCA Diamond Authentication & Certification 2

Question 1

Which grading laboratory is widely considered the most stringent and consistent in diamond certification?

Accepted Answer

GIA

Answer

The Gemological Institute of America (GIA) is the industry standard-setter and is regarded as the most consistent and stringent major grading laboratory.

Question 2

On a GIA diamond grading report, the term 'clarity characteristics' refers to what?

Accepted Answer

Internal and external features used to determine clarity grade

Answer

Clarity characteristics are the internal (inclusions) and external (blemishes) features plotted on the report's diagram and used to assign the clarity grade.

Question 3

What does the 'girdle' description on a diamond grading report indicate?

Accepted Answer

The thickness range of the widest perimeter of the stone

Answer

The girdle description on a report indicates the thickness range (from thinnest to thickest) of the diamond's outer edge.

Question 4

A diamond report with a 'Comments' section noting 'Clarity grade is based on clouds not shown' means what?

Accepted Answer

The cloud inclusions are too small to plot on the diagram but still affect the clarity grade

Answer

This comment indicates clouds are present and affect the grade but are too numerous or small to individually plot on the clarity diagram.

Question 5

Which of the following best describes a 'Type IIa' diamond classification?

Accepted Answer

Has no measurable nitrogen or boron, often colorless or near-colorless

Answer

Type IIa diamonds have no measurable nitrogen impurities, making them chemically pure and often the most colorless diamonds found in nature.

(DCA) Certified Diamond Council of America Diamond Specialist Practice Test

(DCA) Certified Diamond Council of America Diamond Specialist Practice Test

DCA Diamond Authentication & Certification 2