The background color of agate in nature is dark blue, so most agates are dark, so the color is not very bright. Of course ... there are exceptions to everything. Since it is an exception, the quantity is definitely not much, the quantity is not much, and the price is definitely sky-high. Do you understand?
Now agate is bright in color because it changes color when dyed and heated.
Let's start with dyeing. Agate dyeing generally goes through two steps: soaking and high temperature. Because most agate products have a certain thickness, it is impossible to completely soak them in the soaking process. After high temperature fixation, they usually only develop color on the surface and will not penetrate too deep. Please look at the attached drawings. After a beautiful and bright bracelet is broken, the cross section of the bracelet is only colored on the outside, and the white inside should be bluish-gray in a pure natural state, and it becomes white after high temperature treatment.
As for high-temperature discoloration, it is generally red agate, which is characterized by uniform color and red color.
Summary of the problem, agate dyeing (high temperature discoloration) is called optimization method in national standards, and its name can be directly called in the remarks without additional explanation. This passage means that the dyed agate is identified, and the result is "natural agate". The identification book will not mention that this agate is dyed. So, the agate you bought "must be"? "Natural agate", so it is real agate. However, there is no artificial "optimization", which is still worth consulting. I'm sure it's "natural agate", but I don't know if it's an optimized agate ... so I dare not answer randomly.
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PS note pictures come from the network.