Five questions on lesson 7 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.
-
Question 1: Where on the girdle is its thickness judged?
Show the answer
b: At the 16 valleys, where the half facets come closest.
-
Question 2: A report says "Very Thin to Thick". What does that tell you?
Show the answer
a: The range from the thinnest to the thickest valley.
-
Question 3: Why is an extremely thin girdle a problem?
Show the answer
b: A durability risk; a knife-edge counts as Extremely Thin.
-
Question 4: You make the T73's girdle 4.0% thick and it drops to Very Good. What limits it?
Show our answer
The total depth: 63.1%, just past the Excellent limit of 63.0%.
Did you have it? -
Question 5: At the same width, why does the T73 weigh about 10% more than the T57?
Show our answer
Its girdle band adds diamond around the middle: same angles, more depth, more weight.
Did you have it?