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. Which type of diamond treatment involves filling surface-reaching fractures with a glass-like substance to improve apparent clarity?

    Answer: Fracture filling

    Fracture filling uses a glass-like resin to fill surface-reaching fractures, improving the diamond's apparent clarity.

  2. What does 'laser drilling' accomplish when used to treat a diamond?

    Answer: It creates a channel to a dark inclusion so bleaching or acid can lighten it

    Laser drilling bores a tiny channel to a dark inclusion, allowing bleaching agents or acid to lighten or remove the inclusion.

  3. On the GIA scale, which clarity grade is just below 'Internally Flawless (IF)'?

    Answer: VVS1

    VVS1 (Very Very Slightly Included 1) is the grade immediately below Internally Flawless on the GIA clarity scale.

  4. Which phenomenon causes some diamonds to appear a different color face-up than when viewed from the side?

    Answer: Color zoning

    Color zoning is the uneven distribution of color within a diamond, causing different color appearances depending on viewing angle.

  5. What is the hardness of diamond on the Mohs scale?

    Answer: 10

    Diamond is the hardest natural material, rating 10 on the Mohs scale of mineral hardness.

  6. A 'cloud' inclusion in a diamond is best described as:

    Answer: A hazy area caused by a cluster of many tiny pinpoints or crystals

    A cloud is a group of many tiny pinpoints or crystals clustered together, creating a hazy or milky area within the diamond.

  7. Which of the following is a surface blemish rather than an internal inclusion?

    Answer: Scratch

    A scratch is a surface blemish — a thin line on the diamond's surface — whereas feathers, crystals, and clouds are internal inclusions.

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