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► Size：Approximately 1.6"-2"（40 mm-50 mm）
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► Material: Terahertz
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►Terahertz is a man-made gemstone that is invented by Japanese scientists in order to protect the body against electromagnetic smog and harmful radiation. What’s more, it’s an artificial stone called silicon, but terahertz stone has stronger prowess.
This stone is actually believed to be a very strong healing stone that possesses very high oscillating frequency as well as thermal conductivity.