This is a paid asset, but now you can download RPG Game Loot Icons 02 for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
RPG Game Loot Icons 02 v1.0
A set of 50 icons each representing a different loot item, all rendered and manually designed. They can be used in games. The icons come in two versions: one with the gray frame as in the preview and one without the frame.
The files are layered and grouped each labeled and organized for an easier way to use and navigate through them. The pack comes in PNG and editable PSD. The resolution of the icons is 256x256px and you can find the icons layered from the frames.