Synthetic diamond crystals and stones cut from them can be attracted by a strong magnet. This is because these crystals contain metal flux inclusions. So, this feature can be used in diagnostics of diamond origin. This is an indirect diagnostic feature, which can be used to confirm the results of diagnostics based on different methods.

Magnetic properties of natural and synthetic diamonds

• Synthetic diamond crystals and stones cut from them are magnetic, as a rule.
• Most natural diamonds are non-magnetic. However, very rarely, a natural diamond can be attracted by a magnet. This occurs when the diamond contains numerous and/or large inclusions of minerals such as pyrrotine, magnetite, or native iron.

Recommended procedure for studying the magnetic properties of a diamond:

- Take a white paper sheet and a magnet.
- Carefully clean the sample under study before starting the test.
- Test the magnetic properties of the sample.
- Identify the sample using the description of magnetic properties of natural and synthetic diamonds.