As far as the mechanical part of the art goes, the Babylonians may challenge comparison with the most advanced of the nations of antiquity; they decidedly excel the Egyptians, and fall little, if at all, short of the Greeks and Romans.
The extreme minuteness of the work in some of the Babylonian seals and gems raises a suspicion that they must have been engraved by the help of a powerful magnifying-glass.

A lens has been found in Assyria; and there is much reason to believe that the convenience was at least as well known in the lower country.

Glass was certainly in use, and was cut into such shapes as were required.

It is at any rate exceedingly likely that magnifying-glasses, which were undoubtedly known to the Greeks in the time of Aristophanes, were employed by the artisans of Babylon during the most flourishing period of the Empire.
Of Babylonian metal-work we have scarcely any direct means of judging.
The accounts of ancient authors imply that the Babylonians dealt freely with the material, using gold and silver for statues, furniture, and utensils, bronze for gates and images, and iron sometimes for the latter.

We may assume that they likewise employed bronze and iron for tools and weapons, since those metals were certainly so used by the Assyrians.