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Flashcards in Diamond Classification Deck (17):
0

How are diamonds classified by their impurities?

Type I and Type II

1

What is a Type I Diamond

Type I diamonds are diamonds that contain nitrogen.

3

What is a Type II Diamond

Type II diamonds contain no significant amount of nitrogen.

4

What are the classification for Type I

Type Ia
Type Ib

5

What are the classification for Type Ia

Type IaA
Type IaB
Type IaAB

6

What is Type Ia

Nitrogen atoms are present as pairs or small groups called aggregates

7

What is Type Ib

Nitrogen atoms are present as isolated atoms

8

What is Type IaA

Contain aggregates of two nitrogen atoms, A aggregates

9

What is Type IaB

Nitrogen is present as aggregates of four nitrogen toms surrounding a 'vacancy' B aggregates. (Most diamonds containing some nitrogen in the B form also have aggregates of three nitrogen atoms surrounding a vacancy.

10

What is Type IaAB

Type IaAB - Contain both the A and B forms of nitrogen with a mixture of A and B aggregates.

11

Type IIa

Contain no significant impurities, no sharp absorption in the visible region and is capable of conducting electricity.

12

Type IIb

boron atoms are present as an impurity and is not capable to conduct electricity.

13

What is a trace element?

Element that occurs in minute quantities.

14

Why classify?

According to their impurities.

15

What is the most common impurity?

Nitrogen is the most common impurity of a diamond.

16

What do sunlight do to fluorescent diamonds?

They mask their body color compared to light that does not have UV component.

17

What is an impurity?

It's a foreign element within a mineral's structure that is not part of it's integral structure.