What do sapphire mean by "burning" and "not burning"? "Burning" is worthless?

1, the "burning" of gems is actually heating. The formation of gems is due to the high temperature and high pressure heating in the depths of nature for millions of years, which is the "burning" of nature itself. Nowadays, people use advanced science and technology to imitate natural conditions to heat gems. This optimization method is what people now call "burning". Even if the technology is very developed now, this optimization method does not change the color of the gem much, and the risk is extremely high and the yield is extremely low. Therefore, not every gem will be "burned", only gems with certain value will be treated in this way, because once handled carelessly, gems will "disappear" because of this "burning".

2. The "non-burning" of gems is actually the original state of gems coming out of the mining area without any processing and beautification.