Five questions on lesson 5 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: What sets the pavilion depth?
Show the answer
b: Half the diameter × tan of the pavilion angle.
-
Question 2: Light inside a diamond meets a facet 15° from square-on. What happens?
Show the answer
b: It's within the critical angle (24.4° in diamond), so most of it escapes.
-
Question 3: On the light map, what does a flood of blue mean?
Show the answer
b: Light from almost straight above, where your head blocks it.
-
Question 4: At 42.4° the tool traces more brilliance than at 40.8°, but grades it Good. Why?
Show our answer
The grade also weighs contrast and pattern; a very steep pavilion loses both and looks flat.
Did you have it? -
Question 5: What did Tolkowsky say a steeper pavilion would gain, and what would it cost?
Show our answer
More reflection, but less fire; he judged the trade not worth it and chose 40°45'.
Did you have it?