Editing Diamond (section)

=== Chemical stability ===
At room temperature, diamonds do not react with any chemical reagents including strong acids and bases.

In an atmosphere of pure oxygen, diamond has an [[ignition point]] that ranges from {{convert|690|C}} to {{convert|840|C}}; smaller crystals tend to burn more easily. It increases in temperature from red to white heat and burns with a pale blue flame, and continues to burn after the source of heat is removed. By contrast, in air the combustion will cease as soon as the heat is removed because the oxygen is diluted with nitrogen. A clear, flawless, transparent diamond is completely converted to carbon dioxide; any impurities will be left as ash.<ref>{{cite book | vauthors = Bauer M |title=Precious Stones | volume = 1 |date=2012 |publisher=Dover Publications |isbn=978-0-486-15125-0 |pages=115–117}}</ref> Heat generated from cutting a diamond will not ignite the diamond,<ref>{{cite web |title=Diamond Care and Cleaning Guide |url=https://www.gia.edu/diamond-care-cleaning |publisher=Gemological Institute of America |access-date=August 1, 2019 |language=en |archive-date=August 1, 2019 |archive-url=https://web.archive.org/web/20190801170616/https://www.gia.edu/diamond-care-cleaning |url-status=live }}</ref> and neither will a cigarette lighter,<ref>{{cite web |vauthors=Jones C |title=Diamonds are Flammable! How to Safeguard Your Jewelry |url=http://www.dmia.net/diamonds-are-flammable/ |website=DMIA |access-date=August 1, 2019 |date=August 27, 2016 |archive-date=August 1, 2019 |archive-url=https://web.archive.org/web/20190801170616/http://www.dmia.net/diamonds-are-flammable/ |url-status=live }}</ref> but house fires and blow torches are hot enough. Jewelers must be careful when molding the metal in a diamond ring.<ref>{{cite web |vauthors=Baird CS |title=Can you light diamond on fire? |url=https://wtamu.edu/~cbaird/sq/2014/03/27/can-you-light-diamond-on-fire/ |website=Science Questions with Surprising Answers |access-date=August 1, 2019 |archive-date=August 1, 2019 |archive-url=https://web.archive.org/web/20190801170618/https://wtamu.edu/~cbaird/sq/2014/03/27/can-you-light-diamond-on-fire/ |url-status=live }}</ref>

Diamond powder of an appropriate grain size (around 50{{nbsp}}microns) burns with a shower of sparks after ignition from a flame. Consequently, [[pyrotechnic composition]]s based on [[synthetic diamond]] powder can be prepared. The resulting sparks are of the usual red-orange color, comparable to charcoal, but show a very linear trajectory which is explained by their high density.<ref>{{cite journal| vauthors = Lederle F, Koch J, Hübner EG |title=Colored Sparks|journal=European Journal of Inorganic Chemistry|date=February 21, 2019|volume=2019|issue=7|pages=928–937|doi=10.1002/ejic.201801300|s2cid=104449284}}</ref> Diamond also reacts with fluorine gas above about {{convert|700|C}}.