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Quizzes > Lifestyle & Hobbies

Diamond Quiz: Test Your Knowledge of Cut, Color, and Clarity

Quick, free diamond knowledge test. Instant results.

Editorial: Review CompletedCreated By: Ethan RobertsUpdated Aug 28, 2025
Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art depicting a trivia quiz on Diamond Knowledge Assessment

This diamond knowledge quiz helps you check your grasp of cut, color, clarity, and carat in 15 quick questions, with instant feedback. If you enjoy gem topics, try what gemstone am i, explore your birth month with a birthstone quiz, or find a match with what crystal do i need.

Which of the 4Cs most strongly influences a diamond's brilliance when other factors are comparable?
Cut
Color
Clarity
Carat weight
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On the GIA color scale for colorless to light yellow diamonds, which letter represents the highest color grade?
Z
D
F
G
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In standard diamond grading, clarity is assessed at what magnification?
Unaided eye only
5x
10x
20x
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Which inclusion type is most commonly a break in the diamond that can reach the surface?
Cloud
Pinpoint
Needle
Feather
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Which lab is widely recognized for using a color scale from D to Z for diamonds?
ASTM
GIA
CIBJO
ISO
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What is the approximate Mohs hardness of diamond?
7
8
10
9
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Which fluorescence color is most commonly observed in diamonds under long-wave UV?
Yellow
Red
Blue
Green
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A round brilliant diamond typically has how many facets excluding a culet?
57
54
60
58
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Which factor is most directly affected by pavilion angle and depth percentage in a round brilliant?
Color grade
Light return
Fluorescence
Carat weight
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Which cutting step rounds a stone from a preform to establish the outline of a round?
Blocking
Bruiting (girdling)
Sawing
Cleaving
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Which rough crystal form is most typical for gem-quality diamonds?
Dodecahedron
Octahedron
Rhombic dodecahedron only
Cube-octahedron (cuboctahedron)
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Which treatment uses high pressure and high temperature to alter a diamond's color?
HPHT
Laser drilling
Irradiation only
Fracture filling
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Which diamond color origin is most commonly associated with nitrogen impurities?
Blue
Red
Yellow
Green
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Which diamond type is typically electrically conductive due to boron impurities?
Type Ia
Type Ib
Type IIb
Type IIa
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Which phenomenon causes the bow-tie effect in some fancy shapes like oval and marquise cuts?
Strong fluorescence
Light leakage due to facet arrangement
High color saturation
Surface polish lines
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What is the typical refractive index of diamond (n)?
About 2.42
About 1.33
About 1.54
About 2.00
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Which facet group primarily contributes to scintillation through small flashes as the stone moves?
Table
Star and upper-girdle facets
Culet
Lower girdle facets only influence fire
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Which issue is indicated by a very shallow pavilion in a round brilliant viewed face-up?
Windowing
Extinction due to over-deep crown
Nail-head effect
Fish-eye effect
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Which diamond type is generally the purest with negligible impurities, often used as a benchmark for spectroscopy?
Type Ib
Type IIb
Type Ia
Type IIa
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Round brilliants commonly have which lower girdle facet length (as a percentage of half-girdle distance) for crisp arrows?
About 90 to 95%
About 30 to 35%
About 75 to 80%
About 50 to 55%
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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.
  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.
  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.
  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.
  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.
  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.
  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.
  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.
  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.
  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.
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