Practice Test Geeks(GIA) Certified Diamonds Gemological Institute of America Practice Test
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Diamond Grading and Identification 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 and Identification flashcards as text

  1. On the GIA color grading scale, which letter grade represents a truly colorless diamond?

    Answer: D

    D is the highest color grade on the GIA scale and represents a completely colorless diamond.

  2. What does the term 'fluorescence' describe in diamond grading?

    Answer: A diamond's reaction to ultraviolet light

    Fluorescence refers to a diamond's visible light emission when exposed to ultraviolet (UV) radiation.

  3. Which diamond inclusion type is described as a tiny crystal of another mineral trapped inside the diamond?

    Answer: Crystal

    A crystal inclusion is a mineral crystal (which may be another diamond or a different mineral) enclosed within the host diamond.

  4. GIA's cut grade for standard round brilliant diamonds evaluates which combination of factors?

    Answer: Brightness, fire, and scintillation

    GIA's cut grade assesses the overall face-up appearance through brightness, fire, scintillation, as well as design and craftsmanship.

  5. A diamond described as 'SI1' on the GIA clarity scale has inclusions that are:

    Answer: Noticeable under 10x magnification but not to the naked eye

    SI1 (Slightly Included 1) inclusions are noticeable under 10x magnification but typically not visible to the unaided eye.

  6. What is the standard magnification used by GIA graders to assess diamond clarity?

    Answer: 10x

    GIA uses 10x magnification as the industry standard for evaluating diamond clarity.

  7. In GIA grading, what does the term 'table percentage' refer to?

    Answer: The table facet width expressed as a percentage of the average girdle diameter

    Table percentage is the width of the table facet divided by the average girdle diameter, expressed as a percentage.

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