---
title: "Screening device: meaning in gemology"
description: "A screening device separates natural diamonds from laboratory-grown diamonds and simulants. Most answer Pass (natural) or Refer (send to a laboratory)."
url: https://digitalgemology.com/learn/glossary/screening-device
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · Gem testing

# Screening device

Also called diamond screener, Pass/Refer

A screening device separates natural diamonds from laboratory-grown diamonds and simulants. Most answer Pass (natural) or Refer (send to a laboratory).

## In more detail

GIA's DiamondCheck and iD100 are examples. A referred stone may still be natural. Depending on how it tests, a screener may pass a simulant, so know what your device covers.

## Related terms

- [Thermal diamond tester](https://digitalgemology.com/learn/glossary/thermal-diamond-tester): A thermal diamond tester measures how fast a stone draws heat from a hot tip. Diamond conducts heat very well, so it reads “diamond”.
- [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.
- [Raman spectroscopy](https://digitalgemology.com/learn/glossary/raman-spectroscopy): Raman spectroscopy is a laboratory method that identifies a material from how it scatters laser light. Diamond shows a peak at 1332 cm⁻¹.

## 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)