Beijing time on September 8 news, according to foreign media reports, there is a well-known advertising slogan: “Diamond forever.” But in fact, if you take the right amount of heat and give enough oxygen, diamonds can also burn. After all, like black coal, diamonds are made of carbon. It’s just that it’s easier to make coal burn, but it’s a little bit difficult to keep diamonds burning and burning. But at the end of the day, diamonds can burn. < / P > < p > “you have to change the solid [carbon] into a gaseous state so that it can react with the air and produce a flame,” said retired chemist Rick sackleben, a member of the American Chemical Society. < / P > < p > What’s the best way? quantity of heat! And it’s a lot of heat. According to Christopher Baird, a physics professor at West Texas A & M University, the ignition point of a diamond at room temperature is around 1652 degrees Fahrenheit (about 900 degrees Celsius). In contrast, the ignition point of high volatile coal (i.e. coal with a large amount of easily released gases) is about 1233 degrees Fahrenheit (667 degrees Celsius), while the ignition point of wood is 572 degrees Fahrenheit (300 degrees Celsius) or less, depending on the material of the wood. < / P > < p > when heated, diamonds first emit red light and then turn white. High temperatures allow the diamond surface to react with the air, converting carbon to colorless, odorless carbon monoxide. < / P > < p > “carbon plus oxygen produces carbon monoxide, which releases heat; carbon monoxide continues to react with oxygen, releasing more heat; and rising temperatures can take away more carbon monoxide and increase oxygen concentrations,” Baird said. < / P > < p > however, this kind of combustion is only a slight flame. To get a flame on the surface of a diamond, you usually need extra help: 100% oxygen, not just 22% indoor air. An increase in oxygen concentration allows chemical reactions to continue on their own. The carbon monoxide generated by the combustion on the diamond surface combines with oxygen to create a flame dancing on the diamond. < / P > < p > according to the American gemstone Society (GIA), even without pure oxygen, flames can damage diamonds. When the home is on fire or when the anxious jeweler deliberately ignites the diamonds, the diamonds usually do not disappear in the fire, only the surface burns, and then no longer looks shiny, but gray or a little white. However, after cutting off the burned part, the diamond inside is shining as usual. When carbon is burned in oxygen, carbon dioxide and water are produced. Therefore, in theory, if the combustion time is long enough, the pure carbon diamond will disappear; however, most diamonds will still have some impurities, such as nitrogen, so the combustion reaction is not so simple. Global Tech