---
title: "What the four Cs are: lesson quiz"
description: "Five questions on “What the four Cs are”, lesson 1 of Digital Gemology's The four Cs course, in a new order every time, with an explanation for every answer."
url: https://digitalgemology.com/skool/quiz/the-four-cs/what-the-four-cs-are
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

> Markdown copy of https://digitalgemology.com/skool/quiz/the-four-cs/what-the-four-cs-are. 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

[The four Cs](https://digitalgemology.com/skool/quiz/the-four-cs#lessons) · lesson 1

# What the four Cs are

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

Five questions on lesson 1 of The four Cs. 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 does the GIA color scale start at D?
  ### Show the answer
  **b**: The creators wanted no link to the older systems, which people used loosely.
2. Question 2: How many clarity grades are there, from FL to I3?
  ### Show the answer
  **c**: FL, IF, VVS1, VVS2, VS1, VS2, SI1, SI2, I1, I2, I3.
3. Question 3: Which C is measured on a scale and not judged by eye?
  ### Show the answer
  **a**: The lab weighs it on a balance; graders judge the others by eye.
4. Question 4: In the [simulator](https://digitalgemology.com/tools/3d_gemstone_simulator), you change a stone from 1 to 2 carats. What happens to its face-up pattern?
  ### Show the answer
  **b**: The proportions are the same, so the pattern is the same at a larger size.
5. Question 5: Which diamonds get a GIA cut grade?
  ### Show the answer
  **b**: Fancy shapes are too different for one system, so far.

## More

- Next: [Lesson 2, Carat weight: why 2 ct isn't twice as big](https://digitalgemology.com/skool/quiz/the-four-cs/carat-weight)
- [The The four Cs quiz](https://digitalgemology.com/skool/quiz/the-four-cs), on the whole course
- [All The four Cs lesson quizzes](https://digitalgemology.com/skool/quiz/the-four-cs#lessons)
- [The four Cs: all the lessons](https://digitalgemology.com/learn/four-cs)