There are two things specifically haram for men to wear in this dunya: Gold and pure silk (there are exemptions). These two items are adornments exclusively for women in this dunya, and for both men and women in the akhirah.
In addition to it being prohibited for men, if a male was to wear gold or silk in prayer, their prayer will be invalid.
There are certain studies that point to the physical harms of gold for men, like imbalance of blood cells, it being a negative mineral for males, and other such information, (for example see: http://jhsme.muq.ac.ir/article-1-15-fa.pdf) but ultimately the primary evidence are the ahadith mentioned on this issue.
And Allah knows best.