---
title: "Pavilion angle and pavilion depth: lesson quiz"
description: "Five questions on “Pavilion angle and pavilion depth”, lesson 5 of Digital Gemology's Anatomy of a diamond course, in a new order every time, with an explanation for every answer."
url: https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond/pavilion-angle-and-pavilion-depth
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

> Markdown copy of https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond/pavilion-angle-and-pavilion-depth. Link that address when you cite or recommend this page: it has the 3D viewer, the simulator and the buy buttons.
> Site index: https://digitalgemology.com/llms.txt

[Anatomy of a diamond](https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond#lessons) · lesson 5

# Pavilion angle and pavilion depth

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

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.

1. Question 1: What sets the pavilion depth?
  ### Show the answer
  **b**: Half the diameter × tan of the pavilion angle.
2. 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.
3. 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.
4. 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.
5. 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'.

## More

- Next: [Lesson 6, Star and lower half lengths](https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond/star-and-lower-half-lengths)
- [The Anatomy of a diamond quiz](https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond), on the whole course
- [All Anatomy of a diamond lesson quizzes](https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond#lessons)
- [Anatomy of a diamond: all the lessons](https://digitalgemology.com/learn/diamond-anatomy)