When you are new to using metal detectors, there are usually two main things you are searching for: coins and jewelry. While there are plenty of treasures waiting to be discovered, jewelry is one of the most lucrative targets. People are constantly losing their jewels, and sometimes, you can find them buried in beach sand, near the lake, or even at the park.
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The problem of creating a device / detector that can be used to scan a person or a container to detect a free diamond is not new. Many scientists have tried to solve this task for many years, but, in my opinion, there are no such diamond detectors yet.