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.

Read the first 7 Diamond Grading & Classification flashcards as text

  1. Which proportional element most directly affects a round brilliant diamond's light return or 'brilliance'?

    Answer: Pavilion angle

    The pavilion angle is the most critical factor in total internal reflection, which drives the amount of white light returned to the viewer's eye.

  2. A GIA Diamond Grading Report describes a stone as 'Fancy Intense Yellow.' This notation refers to the diamond's:

    Answer: Color beyond the D-to-Z scale

    Diamonds with color saturation beyond Z, or with hues such as yellow, pink, or blue, receive GIA Fancy Color grades with descriptors like Faint, Very Light, Light, Fancy Light, Fancy, Fancy Intense, or Fancy Vivid.

  3. What is the purpose of the 'plotting diagram' on a GIA Diamond Grading Report?

    Answer: To map the location and type of clarity characteristics within the stone

    The plotting diagram is a schematic of the diamond's facets showing the exact position and nature of each inclusion and blemish used to assign the clarity grade.

  4. Under GIA standards, which clarity grade indicates that inclusions are obvious under 10x magnification and may affect transparency or brilliance?

    Answer: I1

    I1 (Included 1) diamonds have inclusions obvious under 10x magnification that may impact brilliance and are often visible to the naked eye.

  5. A diamond's 'star length' proportion refers to the length of which set of facets?

    Answer: Star facets on the crown extending from the table

    Star facets are the eight triangular facets on the crown that radiate from the corners of the table, and their length ratio affects light dispersion.

  6. Which of the following treatments would GIA disclose on a diamond grading report if detected?

    Answer: Fracture filling with glass-like substances

    GIA will not grade fracture-filled diamonds and discloses detected filling treatments because they alter the apparent clarity of the stone.

  7. In assessing cut quality, 'scintillation' specifically refers to:

    Answer: The pattern of light and dark areas and sparkle when a diamond or light source moves

    Scintillation encompasses the sparkle (dynamic flashes) and pattern (static arrangement of light and shadow) a diamond displays as it, the observer, or the light source moves.

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Sources & references

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