Diamonds and precious stones are minerals, which may contain trace radioactive elements, but they are harmless to human body. Since ancient times, people like to wear jewelry, which is enough to prove that they are harmless. The formation of gems mainly depends on geological conditions, such as temperature, pressure and chemical composition. It has nothing to do with whether there is radioactivity around them, that is to say, the existence of radioactivity is not a necessary condition for the formation of gems. Only a few precious stones, such as zircon, may be mixed with a very small amount of radionuclide u-238 during crystallization; Xonotlite and Shi Ying crystals contain certain radioactivity, because they are extremely rare (but not expensive), and some gem researchers collect them as collectibles, which will not enter the market. Looking up ancient and modern Chinese and foreign literatures, we didn't find that a diamond from nature was radioactive. I touched tens of thousands of diamonds, but I didn't find a radioactive diamond. The chemical composition of diamond is carbon. There are three isotopes of carbon, only 14c is radioactive. It only accounts for tens of billions of carbon elements, and disappears after several half-lives (that is, tens of thousands of years), so it is impossible to cause diseases in the human body.

Therefore, natural diamonds in nature will not have any radiation harmful to human body, and some synthetic or artificially processed gems are among them. For example, the blue color emitted by topaz is generally treated by heat treatment or radiation treatment. However, the residual radioactive half-life of color-changing topaz is about 100 days, and the radioactivity can be ignored after one year. Wearing color-changing topaz is safe and will not cause any harm to human body. This shows that no matter whether natural or synthetic diamonds or precious stones, they will not cause any harm to the human body, and everyone can wear them with confidence.