Destructive Gemstone Tests: Hot Point Testing
Step 3: Practical Gemology
Hot point testing can determine if a gem material is natural or a plastic imitation. It can also reveal if a stone is treated with wax or plastic. You can purchase electrically heated hot points or you can make your own. Just insert the blunt end of a needle into a cork. To use, simply heat the needle over a small flame until the tip turns a dull red.
Heavy Liquid Warning
Do not use heavy liquids on a gem before hot point testing. …