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Quizzes > Quizzes for Business > Retail

Take the Diamond Knowledge Assessment Quiz

Evaluate Your Expertise in Diamond Grading

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art depicting a trivia quiz on Diamond Knowledge Assessment

Welcome to the Diamond Knowledge Assessment, an engaging quiz designed to sharpen your understanding of gem grading and diamond certification. This practice quiz features multiple-choice questions on clarity, color, cut, and the characteristics of different diamond shapes. For more in-depth preparation, explore the Diamond Industry Certification Quiz or test shape skills with the Diamond Shape Identification Quiz . Every quiz is freely modifiable in our editor, allowing you to tailor questions to your specific learning goals. Ready to advance? Browse all quizzes and start testing your diamond expertise today.

Which 'C' in the 4 Cs of diamond quality refers to the weight of the diamond?
Carat
Color
Clarity
Cut
Carat measures the weight of a diamond and is one of the four Cs used to assess its quality. It directly affects both value and appearance regardless of the other factors.
Which diamond shape is typically described as having 58 facets and excellent light performance?
Round Brilliant
Princess
Cushion
Oval
The round brilliant cut is designed with 58 facets to maximize light return and sparkle. It is the most popular shape due to its superior brilliance and fire.
Which clarity grade indicates no internal flaws visible under 10x magnification?
Flawless (FL)
Very Very Slight (VVS1)
Very Slight (VS1)
Internally Flawless (IF)
Flawless (FL) means no internal or external imperfections are visible at 10x magnification. It represents the highest clarity grade available.
On the GIA color grading scale, which grade is considered the beginning of the colorless range?
D
G
J
K
The GIA color scale begins at D for completely colorless diamonds. Grades D, E, and F are all classified as colorless.
Which term describes the total light returned to the observer's eye from a diamond?
Brilliance
Fire
Scintillation
Dispersion
Brilliance refers to the combination of all white light returned from a diamond. It is a key factor in evaluating overall light performance.
What information does the plotted inclusion map on a diamond grading report provide?
Exact location and type of inclusions
Estimated market value
Color grade distribution
Facet proportion measurements
The plotted inclusion map shows where blemishes or inclusions are located on the diamond. It helps buyers and gemologists verify clarity characteristics described in the report.
Which diamond shape is characterized by a rectangular outline with truncated corners?
Emerald cut
Princess cut
Oval cut
Marquise cut
An emerald cut features a rectangular outline and truncated corners with step-cut facets. It emphasizes clarity and produces a hall-of-mirrors effect.
At what grade does the near-colorless category begin on the GIA color scale?
G
F
H
J
The GIA near-colorless range covers grades G, H, I, and J. Grade G is the first in this category, showing slight color under close inspection.
Which clarity grade corresponds to Very, Very Slight inclusions?
VVS1
VS1
SI1
IF
VVS1 stands for Very, Very Slight inclusions that are extremely difficult to see under 10x magnification. It indicates very high clarity.
Which light performance attribute refers to the splitting of white light into spectral colors?
Fire
Brilliance
Scintillation
Luster
Fire is the term used for the dispersion of white light into flashes of color. It is one of the three main light performance qualities in a diamond.
Which treatment involves using a laser to remove or reduce the appearance of dark inclusions in a diamond?
Laser drilling
Fracture filling
HPHT
Irradiation
Laser drilling targets dark inclusions by creating a tiny hole with a laser, then bleaching or dissolving them. It does not fill fractures but removes or lightens inclusions.
Which process is used to improve diamond color by subjecting it to high temperature and pressure?
HPHT treatment
Laser drilling
Fracture filling
Bleaching
High Pressure High Temperature (HPHT) treatment alters a diamond's color by changing its crystal lattice under extreme conditions. It can turn brownish diamonds colorless or into fancy colors.
On a grading report, a girdle inscription 'CVD' indicates what about the diamond?
It is lab-grown via chemical vapor deposition
It is a natural untreated diamond
It has been HPHT treated
It has been fracture filled
A 'CVD' inscription signifies that the diamond was grown in a lab using Chemical Vapor Deposition. Certificates note this to distinguish lab-grown from natural stones.
A pavilion angle steeper than the ideal range typically causes which issue in a diamond?
Light leakage
Excessive brilliance
Increased fire
Better scintillation
A pavilion angle that is too steep allows light to escape through the pavilion rather than reflecting back to the observer, reducing brilliance and sparkle.
Which clarity grade indicates internal flaws are easily visible under 10x magnification and may impact durability?
I2
SI2
VS2
VVS2
I2 clarity means inclusions are obvious under 10x magnification and can often be seen with the naked eye, sometimes affecting the stone's durability.
Two diamonds are identical in carat weight, color grade, and clarity grade but differ in cut grade: one is graded Excellent cut and the other Very Good cut. Which diamond will exhibit superior light performance?
The Excellent cut diamond
The Very Good cut diamond
Both perform the same
Cut grade doesn't affect performance
Cut grade directly influences how well a diamond returns light. An Excellent cut maximizes brilliance, fire, and scintillation more than a Very Good cut.
Compared to a round brilliant cut, why might a cushion cut diamond display more fire?
Larger facets emphasize colored light dispersion
Greater symmetry increases brilliance
Deeper pavilion increases brilliance
Smaller table reduces scintillation
Cushion cuts have larger facet surfaces that separate and showcase spectral colors more prominently. This facet pattern yields stronger fire compared to some round brilliants.
Which characteristic visible under magnification is a key indicator that a diamond has been fracture filled?
Unnatural rainbow or flash effects along fracture lines
Laser drill holes
Grain lines along the girdle
Cuboid metallic inclusions
Fracture filling uses glass-like substances to fill breaks, creating strong rainbow flashes or unnatural reflections along fissures. These are not found in untreated stones.
Which spectroscopic feature can indicate that a diamond has undergone HPHT treatment?
Altered nitrogen aggregation state and specific absorption lines
Strong hydrogen-related lines
Unusually strong blue fluorescence
Complete lack of fluorescence
HPHT alters the nitrogen aggregation in diamond, which changes specific infrared and UV-visible absorption patterns. These spectral signatures help identify treated stones.
Observing a diamond that exhibits blue phosphorescence lasting several seconds after UV exposure most likely suggests what?
Synthetic or treated origin
High natural fluorescence
Exceptional natural color grade
Rare natural Type IIa classification
Prolonged blue phosphorescence is uncommon in natural diamonds and often indicates CVD or HPHT grown materials. Natural stones usually show short or no phosphorescence.
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Learning Outcomes

  1. Analyse the 4 Cs to assess diamond quality accurately
  2. Identify key characteristics of popular diamond shapes
  3. Evaluate grading reports for precise gemstone valuations
  4. Apply clarity and color grading scales in real scenarios
  5. Demonstrate mastery of cut and light performance principles
  6. Master techniques for distinguishing diamond treatments and enhancements

Cheat Sheet

  1. Master the 4 Cs of Diamond Quality - Step into the glittering world of Cut, Color, Clarity, and Carat weight to see how these fab four work together to make a diamond dazzle. A perfect cut can turn a modest gem into a superstar, even if the color grade is a bit lower. Learn the 4 Cs
  2. Recognize Popular Diamond Shapes - Round, princess, emerald… oh my! Each shape has its own sparkle personality: rounds maximize fire, princesses flaunt modern edges, and emeralds showcase clarity with chic steps. Knowing your shapes helps you pick the perfect style. Explore diamond shapes
  3. Interpret Diamond Grading Reports - Think of grading reports as treasure maps that reveal your diamond's secret specs, from the 4 Cs to fluorescence and treatments. Learning to read the fine print ensures you know exactly what you're getting - and why it costs what it does. Decode grading reports
  4. Apply Clarity Grading Scales - Clarity grades span Flawless (FL) to Included (I), but don't panic at "SI" - many slight inclusions hide from the naked eye. Spotting how imperfections affect brilliance will make you a savvy shopper. Check clarity scales
  5. Understand Color Grading - Diamonds are rated D (colorless) through Z (light yellow or brown), with D - F being the superstar, colorless league. Grasping how tint impacts value will help you balance budget and beauty like a pro. Dive into color grading
  6. Evaluate Cut and Light Performance - A diamond's cut is its superpower - when proportions hit the sweet spot, light bounces around like a disco ball. Mastering cut grades lets you spot gems that truly sparkle without the sticker shock. Discover cut & light
  7. Identify Diamond Treatments and Enhancements - From laser drilling to fracture filling, treatments can boost a diamond's look but might alter its value. Always peek at the grading report's disclosure so you're never caught off guard. Learn about treatments
  8. Comprehend Carat Weight and Size Perception - Carat measures a gem's mass, but cut and shape play magic tricks on perceived size. A snappy cut on a 0.90 ct stone can look just as grand as a sloppy 1.00 ct. Understand carat weight
  9. Understand Fluorescence in Diamonds - Some diamonds glow under UV light, graded from None to Very Strong, which can tweak their look in daylight or clubs. Learning when fluorescence is a friend (or foe) keeps your sparkle savvy. Explore fluorescence
  10. Recognize the Importance of Proportions and Symmetry - Well-balanced proportions and perfect symmetry ensure maximum light return, boosting brilliance and fire. Spotting these hidden heroes will elevate you from shopper to gem guru. Study proportions & symmetry
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