Practice Test Geeks(CGA) Certified Gemologist Appraiser Practice Test
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CGA Diamond Grading & Gemological Science Flashcards

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

Read the first 6 CGA Diamond Grading & Gemological Science flashcards as text

  1. A CGA appraiser examines a diamond and finds it has an 'SI1' clarity grade. What does this mean?

    Answer: Slightly included, with inclusions visible under 10x magnification

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

  2. Which certification laboratory is considered the most respected and widely recognized for diamond grading in the US?

    Answer: GIA (Gemological Institute of America)

    The GIA (Gemological Institute of America) is widely considered the gold standard for diamond grading and established the internationally recognized 4Cs grading system.

  3. What is a 'fancy color' diamond?

    Answer: A diamond with a naturally occurring intense color outside the normal D-Z range

    Fancy color diamonds are natural diamonds that display strong, saturated colors such as yellow, pink, blue, or green, grading beyond the normal D-Z scale and often commanding premium prices.

  4. What does 'ideal cut' mean in the context of AGS diamond grading?

    Answer: A cut achieving AGS grade 0 with optimal proportions for light performance

    An 'Ideal Cut' in AGS grading refers to diamonds receiving an AGS grade of 0 (Ideal) for cut, indicating optimal proportions, symmetry, and polish that maximize light return.

  5. What is 'brilliance' in a diamond?

    Answer: The total reflection of white light from within and surface of a diamond

    Brilliance is the total amount of white light reflected back to the viewer from both the interior and exterior surfaces of a diamond, and is primarily determined by the quality of the cut.

  6. When performing a diamond appraisal, why is it important to measure the diamond while it is unmounted?

    Answer: Settings can obscure inclusions and affect accurate weight estimation

    Measuring a diamond out of its setting ensures accurate dimension measurements for weight estimation and allows full examination of the girdle, pavilion, and all facets without obstructions from prongs or bezels.