Pictured are nano diamond particles, grown synthetically in the lab using chemical vapour deposition. The crystals can be seen clearly, on an average being about 100nm in size.
<a href="//commons.wikimedia.org/w/index.php?title=User:Tanna.myeweb&amp;action=edit&amp;redlink=1" class="new" title="User:Tanna.myeweb (page does not exist)">D. Mukherjee</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>