---
title: "Who is this stone? Number, shape, measurements: lesson quiz"
description: "Five questions on “Who is this stone? Number, shape, measurements”, lesson 2 of Digital Gemology's Reading a grading report course, in a new order every time, with an explanation for every answer."
url: https://digitalgemology.com/skool/quiz/reading-a-grading-report/who-is-this-stone
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

> Markdown copy of https://digitalgemology.com/skool/quiz/reading-a-grading-report/who-is-this-stone. 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

[Reading a grading report](https://digitalgemology.com/skool/quiz/reading-a-grading-report#lessons) · lesson 2

# Who is this stone? Number, shape, measurements

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

Five questions on lesson 2 of Reading a grading report. 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: A report gives "6.42 – 6.47 × 3.99 mm". What kind of shape is it?
  ### Show the answer
  **a**: Two diameters and a depth: the round format.
2. Question 2: To how many decimals does a GIA report give the carat weight?
  ### Show the answer
  **a**: Weighed to five decimals, reported to two.
3. Question 3: Which inscription does every lab-grown diamond graded by IGI carry?
  ### Show the answer
  **b**: Automatically, for every lab-grown stone IGI grades.
4. Question 4: A 1.00 ct stone measures 6.67 mm, but its report says 6.48 mm. What can you conclude?
  ### Show our answer
  The report doesn't belong to that stone. The stone may be a different material or cut, and a lab can confirm which.
5. Question 5: Name three ways to check that a GIA report is genuine and matches the stone.
  ### Show our answer
  Any three of: the girdle inscription, Report Check or the QR code, the security features on the paper, matching the measurements and weight.

## More

- Next: [Lesson 3, The grades: color, clarity, cut](https://digitalgemology.com/skool/quiz/reading-a-grading-report/the-grades)
- [The Reading a grading report quiz](https://digitalgemology.com/skool/quiz/reading-a-grading-report), on the whole course
- [All Reading a grading report lesson quizzes](https://digitalgemology.com/skool/quiz/reading-a-grading-report#lessons)
- [Reading a grading report: all the lessons](https://digitalgemology.com/learn/grading-reports)