---
title: "Type IIb diamond: meaning in gemology"
description: "A type IIb diamond contains boron, which can make it blue or gray. The boron also lets it conduct electricity."
url: https://digitalgemology.com/learn/glossary/type-iib-diamond
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · Diamond and simulants

# Type IIb diamond

Also called type IIb, boron-blue diamond

A type IIb diamond contains boron, which can make it blue or gray. The boron also lets it conduct electricity.

## In more detail

That is why a blue diamond can read "moissanite" on an electrical tester. Labs grow boron-blue diamonds too, so a blue stone that conducts needs a gem lab.

## Related terms

- [Electrical conductivity tester](https://digitalgemology.com/learn/glossary/electrical-conductivity-tester): An electrical conductivity tester checks whether a stone conducts electricity. Many moissanites conduct, and most near-colorless diamonds do not.
- [Fancy color diamond](https://digitalgemology.com/learn/glossary/fancy-color-diamond): A fancy color diamond is a colored diamond with enough color for a fancy grade. To GIA, any diamond outside the D-to-Z scale is a colored diamond.
- [Laboratory-grown diamond](https://digitalgemology.com/learn/glossary/laboratory-grown-diamond): A laboratory-grown diamond is a diamond that people grow with machines, by HPHT or CVD. It has essentially the same composition, crystal structure and properties as a natural diamond.

## Learn more

- [Diamond testers and moissanite: what the instruments say](https://digitalgemology.com/learn/diamond-vs-moissanite/diamond-tester-and-moissanite)

[All 328 terms](https://digitalgemology.com/learn/glossary)