Riches vs richness

Is this sentence wrong, and why?

My richness is having friends.

A friend of mine corrected me in:

My riches are having friends.

A bit of context. I wanted to say that my friends are my richness (in life), i.e., my richness (in life) is having friends who care for me [blah blah blah]

Is this sentence wrong? Did I misuse the word "richness"?

A similar sentence is "My richness is having time to do other things" that I found in this article: https://dairystar.com/Content/News/Print-edition-click-here-/Article/One-breed-farm/1/1/7878.

Solution 1:

Both mean slightly different things but are grammatically correct.

My richness is having friends.

This means the thing that gives you depth as a person is your contacts. Richness comes from within. A chocolate cake's richness is its flavor. A hermit's richness is sage advice.

My riches are having friends.

This means the thing you treasure is having friends. A mother's riches could be her children, while Scrooge McDuck's riches were his literal piles of money.