How to tell if a diamond is real or fake using the scratch test. Here's a common fake diamond cubic zirconia. Let's see what happens when I use the tip of another fake diamond to scratch this fake diamond. It's completely scratched. Now here's a real diamond. Let's try scratching it using the tip of a fake diamond. The real diamond doesn't scratch at all. This is because real diamonds are one of the hardest materials on Earth.
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