---
title: "How a diamond is measured: lesson quiz"
description: "Five questions on “How a diamond is measured”, lesson 2 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/how-a-diamond-is-measured
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Anatomy of a diamond](https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond#lessons) · lesson 2

# How a diamond is measured

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

Five questions on lesson 2 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: On a report, a round reads 6.50 – 6.56 × 4.02 mm. What's its average diameter?
  ### Show the answer
  **b**: (6.50 + 6.56) / 2.
2. Question 2: What is the total depth of that stone, roughly?
  ### Show the answer
  **b**: 4.02 / 6.53 = 61.6%.
3. Question 3: You make the girdle thicker in the [Cut Grading Tool](https://digitalgemology.com/tools/cut-grading-tool). What happens to the pavilion depth?
  ### Show the answer
  **b**: The pavilion depth follows the pavilion angle; the girdle only adds to the total.
4. Question 4: Why are proportions given as percentages and not in millimeters?
  ### Show the answer
  **b**: A percentage means the same thing at 0.5 ct and at 5 ct.
5. Question 5: Two 1.00 ct rounds: one is 61.7% deep, one is 67.5% deep. Which faces up larger, and why?
  ### Show our answer
  The 61.7%: the deeper stone puts more of its weight below the girdle, so it's narrower for its carat.

## More

- Next: [Lesson 3, Table size: is a bigger window brighter?](https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond/table-size)
- [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)