DCA Diamond Grading & Classification 3

Question 1

A diamond exhibits strong blue fluorescence. Under normal lighting conditions, this most commonly makes the diamond appear:

Accepted Answer

Slightly whiter or milky

Answer

Strong blue fluorescence can make a lower-color diamond appear whiter in daylight but may cause a milky or hazy appearance in some stones.

Question 2

Which diamond shape is cut to maximize carat weight retention from an octahedral rough crystal?

Accepted Answer

Princess cut

Answer

The princess cut (square modified brilliant) is specifically designed to retain more weight from an octahedral rough crystal than a round brilliant.

Question 3

In diamond grading, the term 'twinning wisps' refers to:

Accepted Answer

Inclusions formed along irregular crystal growth disturbances

Answer

Twinning wisps are series of pinpoints, clouds, or crystals arranged along a twinning plane caused by irregular crystal growth.

Question 4

What GIA polish grade indicates that polish features are not visible under 10x magnification but are detectable under higher magnification?

Accepted Answer

Excellent

Answer

An Excellent polish grade means no polish features are detectable under 10x magnification, making the surface virtually perfect at standard grading magnification.

Question 5

A customer asks about a diamond with an 'I' clarity grade. Which best describes this stone?

Accepted Answer

Included with inclusions visible to the naked eye

Answer

The I1, I2, and I3 clarity grades represent 'Included' diamonds with inclusions that are obvious under 10x and may affect transparency or brilliance.

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

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

DCA Diamond Grading & Classification 3