Five questions on lesson 1 of The history of the brilliant. 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: Why could people shape diamond only with diamond?
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b: Diamond is the hardest material known, so only its own powder can grind it.
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Question 2: What did Van Berquem most likely add to diamond cutting?
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b: Polishing was at least a century older. His contribution was symmetry, and perhaps a better iron wheel.
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Question 3: The old single scores 84 for fire and the T73 78. Does that mean the old single returns more colored light overall?
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b: Read the scores as rough percentages: 84% of a smaller amount of returned light (brilliance 72) is less color than 78% of a larger amount (93).
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Question 4: Which number explains most of the old single's lower brilliance?
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Leakage: 19% of the light leaves through the pavilion, against 2% in the T73.
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Question 5: Why does the old single score only 44 for scintillation?
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The Wheel counts scintillation from the facets that reach the surface, and the old single has only 26.
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