Other items that metal detectors won't be able to locate include:
Gemstones.
Paper.
Pearls.
Bone.
Stone figures.
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Metal detecting at low tide will give you the best chance of finding objects. However, be sure to check the tides before you start detecting so that you don't get caught out by the rising water. Be respectful of the beach and its wildlife. Avoid digging in areas where there are plants or animals.