Practice Test Geeks(GIA) Certified Diamonds Gemological Institute of America Practice Test
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Diamond Grading & Classification Flashcards

7 cards from real GIA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which diamond shape is defined by having 58 facets arranged to maximize light return through its circular outline?

    Answer: Round Brilliant

    The standard round brilliant cut has 58 facets (or 57 if there is no culet) specifically engineered to optimize brilliance, fire, and scintillation.

  2. A diamond graded 'K' on the GIA color scale falls into which color category?

    Answer: Faint

    GIA classifies K, L, and M color grades as 'Faint,' meaning a slight yellow or brown tint is noticeable, especially when the diamond is face-up.

  3. What does a 'laser drill hole' clarity characteristic indicate on a GIA report?

    Answer: A man-made tunnel drilled to reach and bleach a dark inclusion

    Laser drilling is a treatment in which a tiny channel is burned through the diamond to reach a dark inclusion so it can be bleached or dissolved.

  4. When comparing two round brilliants of equal carat weight, the diamond with a shallower total depth percentage will typically appear:

    Answer: Larger in diameter

    A shallower cut spreads the carat weight across a wider diameter, making the diamond appear larger face-up, though it may sacrifice light performance.

  5. On a GIA grading report, 'polish' grades evaluate which aspect of the diamond?

    Answer: The overall smoothness and quality of each facet's surface

    GIA's polish grade (Excellent, Very Good, Good, Fair, Poor) reflects the care taken in polishing each facet and the absence of polishing defects.

  6. Which of the following best describes 'twinning wisps' as a diamond clarity characteristic?

    Answer: Series of pinpoints, clouds, or crystals along a twinning plane within the diamond

    Twinning wisps form where two diamond crystals grew together in different orientations, creating irregular planes of pinpoints, clouds, or crystals.

  7. A GIA grader examining a diamond's symmetry would penalize a stone for which of the following?

    Answer: Off-center culet

    An off-center culet is a symmetry deviation; GIA's symmetry grade evaluates alignment, centering, and shape of facets—not clarity or color characteristics.

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  1. gia.edu — Test delivery, fees, exam format, passing score, retake fee, registration · verified Oct 2026