maybe the diamond had hamburger grease on it... oils...
thats the only guess i could think of that made any sense...
[and i just confirmed it]
https://www.livescience.com/63383-ant-s ... amond.html Food for thought
In general, when foraging ants pick something up, it's usually a piece of food, McCreery said. Ants may also carry materials to incorporate into their homes, but it's not very likely that this ant had an engineering purpose in mind for the diamond. The more probable explanation is that there was a substance coating the gem, which made the ant think it was something edible, McCreery said.
It was also surprising to see that the ant was able to grasp something as slick as a diamond, though the gem's shape may have made it easier for the ant to grip it between its jaws, she added.
The video ends on a suspenseful note: It cuts abruptly while the ant is still marching resolutely along. Viewers are then left wondering if the person behind the camera decided that enough was enough and retrieved their property from the pint-size crook, or if they decided to let the ant escape with its ill-gotten treasure and live to steal another day.