In fact, it is a marketing means to cater to the public psychology and actually fool consumers. As we all know, the main component of diamond is "carbon", which is formed at high temperature and high pressure. Commonly known as "diamond". Now diamond has been successfully synthesized in the laboratory and has been widely used in many fields. Even diamond rings bought in shopping malls are likely to be synthetic, not pure natural "diamonds". Moreover, diamonds have no value preservation function, and it is rare to buy diamond rings anywhere. What's more, the reason why diamond rings are so "expensive" is that apart from hype, a larger part of the cost is processing fees. From the initial simple polishing, to the so-called Italian "eight hearts and eight arrows", to the later "ten hearts and ten arrows", and even now the diamond processing technology has reached "twelve hearts and twelve arrows". The more exquisite the technology, the higher the cost. Just as gold bars and bricks are stored for preservation, but rings, necklaces, bracelets and earrings cannot be stored, processing costs account for a large proportion. What's more, "diamond" is too small to keep its value, except that it is particularly large and the material is particularly good.