Five questions on lesson 6 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: What does star length measure?
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b: A percentage of the distance from the table edge to the girdle.
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Question 2: A stone has a 90% lower half length and Excellent everything else. What's the best grade it can get?
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b: 90% is outside 70–85% but inside the Very Good range.
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Question 3: Why would a cutter paint or dig out the half facets?
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b: Painting and digging out trade looks for weight.
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Question 4: The T73 and T105 both read 100% symmetry in the H&A Scope but show different hearts. Why?
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Symmetry says the eight hearts match; the T105's extra rows of lower facets change what each heart looks like.
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Question 5: Can a star length of 30% take a stone below Good?
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No. 30% is outside the Very Good range (40–70%), so on its own it limits the stone to Good. But GIA's tables allow any star length at Good, so it can't pull the stone lower.
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