The amazing golden color of these scarab beetles (Chrysina resplendens) is not a result of pigmentation or actual metal, but ≈70 microscropic chitin layers of decreasing thickness that reflect light to produce a metallic effect.

Video credit: insecthaus_adi/ig
Source: https://www.instagram.com/p/BVaHvmIhjbb/

Further reading: https://www.eurekalert.org/news-releases/882153