---
title: "Courses"
description: "Digital Gemology's free courses: the four Cs, the anatomy of a diamond, grading reports, diamond vs moissanite and the history of the brilliant, each with a quiz on this site."
url: https://digitalgemology.com/skool
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

> Markdown copy of https://digitalgemology.com/skool. 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

Digital Gemology

# Courses

Five free courses, each with a quiz here

Our courses are free, here on the website. Each course has short lessons built around our free tools, and ends with a quiz.

- ## [The four Cs](https://digitalgemology.com/learn/four-cs)
  Carat, color, clarity and cut: what each one measures, how a lab grades it, and how much each changes the look of a stone.
  8 lessons · quiz of 16 questions · 8 lesson quizzes
  - [Read the lessons](https://digitalgemology.com/learn/four-cs)
  - [Take the quiz](https://digitalgemology.com/skool/quiz/the-four-cs)
  - [Lesson quizzes](https://digitalgemology.com/skool/quiz/the-four-cs#lessons)
- ## [Anatomy of a diamond](https://digitalgemology.com/learn/diamond-anatomy)
  Every part of a round brilliant and every proportion on a report, rebuilt in the Cut Grading Tool.
  9 lessons · quiz of 12 questions · 9 lesson quizzes
  - [Read the lessons](https://digitalgemology.com/learn/diamond-anatomy)
  - [Take the quiz](https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond)
  - [Lesson quizzes](https://digitalgemology.com/skool/quiz/anatomy-of-a-diamond#lessons)
- ## [Reading a grading report](https://digitalgemology.com/learn/grading-reports)
  A diamond grading report from top to bottom, field by field, and where an IGI report differs from a GIA one.
  9 lessons · quiz of 12 questions · 9 lesson quizzes
  - [Read the lessons](https://digitalgemology.com/learn/grading-reports)
  - [Take the quiz](https://digitalgemology.com/skool/quiz/reading-a-grading-report)
  - [Lesson quizzes](https://digitalgemology.com/skool/quiz/reading-a-grading-report#lessons)
- ## [Diamond vs moissanite](https://digitalgemology.com/learn/diamond-vs-moissanite)
  What diamond and moissanite are, how to tell them apart with a loupe, a scale and the standard instruments, and when a stone goes to a lab.
  10 lessons · quiz of 15 questions · 10 lesson quizzes
  - [Read the lessons](https://digitalgemology.com/learn/diamond-vs-moissanite)
  - [Take the quiz](https://digitalgemology.com/skool/quiz/diamond-vs-moissanite)
  - [Lesson quizzes](https://digitalgemology.com/skool/quiz/diamond-vs-moissanite#lessons)
- ## [The history of the brilliant](https://digitalgemology.com/learn/historic-cuts)
  Eight steps from the old single cut to a computer-designed round, the technology behind each, and what each did to the light.
  8 lessons · quiz of 13 questions · 8 lesson quizzes
  - [Read the lessons](https://digitalgemology.com/learn/historic-cuts)
  - [Take the quiz](https://digitalgemology.com/skool/quiz/the-history-of-the-brilliant)
  - [Lesson quizzes](https://digitalgemology.com/skool/quiz/the-history-of-the-brilliant#lessons)

## The quizzes

Each course has a quiz on the whole course and a short quiz for every lesson. In a lesson quiz, the questions and the answers to pick from come in a new order every time. A multiple-choice question marks itself when you pick an answer. For the other questions, think of your answer, show our answer, and say whether you had it. At the end, you see your score and the lessons that are worth another look. Nothing is saved or sent: close the page and the quiz starts again.

[All the quizzes](https://digitalgemology.com/skool/quiz/)