---
title: "Refractive index: why DG-Anteros exists: lesson quiz"
description: "Five questions on “Refractive index: why DG-Anteros exists”, lesson 3 of Digital Gemology's Diamond vs moissanite course, in a new order every time, with an explanation for every answer."
url: https://digitalgemology.com/skool/quiz/diamond-vs-moissanite/refractive-index-why-dg-anteros-exists
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Diamond vs moissanite](https://digitalgemology.com/skool/quiz/diamond-vs-moissanite#lessons) · lesson 3

# Refractive index: why DG-Anteros exists

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

Five questions on lesson 3 of Diamond vs moissanite. 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 does a refractive index of 2.417 mean?
  ### Show the answer
  **b**: The index is the ratio of light's speed in a vacuum to its speed in the stone.
2. Question 2: Why does the T73 lose its hearts and arrows in moissanite?
  ### Show the answer
  **b**: The T73's angles were solved for 2.417, not 2.65.
3. Question 3: A seller shows 100% symmetry from an H&A viewer for a moissanite cut to diamond proportions. The seller promises "perfect hearts and arrows". What's wrong?
  ### Show the answer
  **b**: Symmetry makes a pattern even. The proportions decide whether the pattern forms.
4. Question 4: You cut DG-Anteros in diamond. What do you see in the viewer?
  ### Show our answer
  Dark arrows and flooded hearts. The cut is matched to moissanite, not to diamond.
5. Question 5: In the H&A Scope, which two controls brought the hearts back to the T73 in moissanite, and roughly where did you set them?
  ### Show our answer
  Pavilion angle and crown angle, around 40.1° and 33°. Those are DG-Anteros's own angles.

## More

- Next: [Lesson 4, Fire: the main optical difference](https://digitalgemology.com/skool/quiz/diamond-vs-moissanite/fire-the-main-optical-difference)
- [The Diamond vs moissanite quiz](https://digitalgemology.com/skool/quiz/diamond-vs-moissanite), on the whole course
- [All Diamond vs moissanite lesson quizzes](https://digitalgemology.com/skool/quiz/diamond-vs-moissanite#lessons)
- [Diamond vs moissanite: all the lessons](https://digitalgemology.com/learn/diamond-vs-moissanite)