It seems that Ruby lacks the diagram of a core object model. The only
helpful article I found was
http://jeromedalbert.com/a-diagram-of-the-ruby-core-object-model/, but
it doesn't include some classes and some words are not so easy to read.

So I tried to make good visualization and created this diagram:

https://lh4.googleusercontent.com/e_Eml6aYg1udItOLjQCzUKF1L2K1JcjyZTnzYwcP7A=w1530-h800-no

I hope it will be helpful. If you find any mistakes please inform me so
I can update this diagram (I will post updated version at this page:
http://rubylangfindings.blogspot.com/2013/12/ruby-core-object-model.html)

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