If you want to know whether a diamond is real, breathe on it....

If you want to know whether a diamond is real, breathe on it.

Diamonds are very efficient heat conductors, so the fog from your breath will disappear almost immediately if it is real.

If the fog sticks around a few seconds before clearing up, the rock is probably a fake.

(Source, Source 2, Source 3)

from did you know? https://ift.tt/3cuHnyf