General and off-topic discussions
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Personally, I have not had such situations. Although I have repeatedly heard from friends that such things happen. That is why diamonds need to be inspected and certified. In the case of jewelry stores, if you have any doubts about the quality of diamonds, you can do two things - refuse to buy such diamonds, or send them for testing to this laboratory https://gemscience.net/contact/ Only after receiving results from this laboratory can you be 100 percent sure about the authenticity of diamonds.