---
title: "The old mine: tidier, not brighter: lesson quiz"
description: "Five questions on “The old mine: tidier, not brighter”, lesson 4 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-mine-tidier-not-brighter
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 4

# The old mine: tidier, not brighter

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

Five questions on lesson 4 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: What changed in diamond supply in the 1720s?
  ### Show the answer
  **b**: Brazil (1725 or 1728, depending on the source).
2. Question 2: According to Tolkowsky, how did the triple cut change into the old mine?
  ### Show the answer
  **b**: Still by hand; the machine came in the 1870s.
3. Question 3: Which score improves from the Peruzzi to the old mine, and which falls the most?
  ### Show our answer
  Symmetry improves (85 → 90); brilliance falls the most (75 → 59).
4. Question 4: Why does scintillation stay at 81?
  ### Show our answer
  The facet count doesn't change: 74 in both models.
5. Question 5: A friend says, "It's rounder and more even, so it must be brighter." What do you tell them?
  ### Show our answer
  Neatness is craftsmanship. Brightness depends on the angles, and nobody calculated those. The old mine leaks 32% of its light.

## More

- Next: [Lesson 5, The old European: when the outline went round](https://digitalgemology.com/skool/quiz/the-history-of-the-brilliant/the-old-european-when-the-outline-went-round)
- [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)