Five questions on lesson 2 of Anatomy of a diamond. The questions and the answers to pick from come in a new order every time you start.
Pick an answer, and the question marks itself. For a question that you answer in your own words, think of your answer first. Then show our answer and say whether you had it. Nothing is saved or sent.
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Question 1: On a report, a round reads 6.50 – 6.56 × 4.02 mm. What's its average diameter?
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b: (6.50 + 6.56) / 2.
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Question 2: What is the total depth of that stone, roughly?
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b: 4.02 / 6.53 = 61.6%.
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Question 3: You make the girdle thicker in the Cut Grading Tool. What happens to the pavilion depth?
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b: The pavilion depth follows the pavilion angle; the girdle only adds to the total.
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Question 4: Why are proportions given as percentages and not in millimeters?
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b: A percentage means the same thing at 0.5 ct and at 5 ct.
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Question 5: Two 1.00 ct rounds: one is 61.7% deep, one is 67.5% deep. Which faces up larger, and why?
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The 61.7%: the deeper stone puts more of its weight below the girdle, so it's narrower for its carat.
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