---
title: "The old single: eight facets and a lot of fire: lesson quiz"
description: "Five questions on “The old single: eight facets and a lot of fire”, lesson 1 of Digital Gemology's The history of the brilliant course, in a new order every time, with an explanation for every answer."
url: https://digitalgemology.com/skool/quiz/the-history-of-the-brilliant/the-old-single-eight-facets-and-a-lot-of-fire
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[The history of the brilliant](https://digitalgemology.com/skool/quiz/the-history-of-the-brilliant#lessons) · lesson 1

# The old single: eight facets and a lot of fire

Lesson quiz · five questions, in a new order every time

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.

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

## More

- Next: [Lesson 2, The Mazarin: the first brilliant](https://digitalgemology.com/skool/quiz/the-history-of-the-brilliant/the-mazarin-the-first-brilliant)
- [The The history of the brilliant quiz](https://digitalgemology.com/skool/quiz/the-history-of-the-brilliant), on the whole course
- [All The history of the brilliant lesson quizzes](https://digitalgemology.com/skool/quiz/the-history-of-the-brilliant#lessons)
- [The history of the brilliant: all the lessons](https://digitalgemology.com/learn/historic-cuts)