Five questions on lesson 5 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.
-
Question 1: What does bruting do?
Show the answer
b: It grinds the outline against another diamond; by machine from the 1870s.
-
Question 2: Why could the old European be cut thinner than the cushions before it?
Show the answer
b: On a cushion, corners and sides need different angles; on a circle, one angle works everywhere.
-
Question 3: How many facets did the old European add to the old mine?
Show our answer
None: the same 58 facets.
Did you have it? -
Question 4: By how much does brilliance rise from the old mine to the old European, and what happens to leakage?
Show our answer
59 → 90, +31 points; leakage drops from 32% to 5%.
Did you have it? -
Question 5: Someone says old European cuts have more fire than modern rounds. What does our Wheel say, and what might they be seeing?
Show our answer
The Wheel gives 74 against the T73's 78. The small table makes big, slow flashes. These can look fierier, even though less of the returned light is color.
Did you have it?