What's the word for mature, steady, kind and true feelings?

Use Chen.

Chen Ye means treasure and jade. This word is next to the word "Wang", which stands for kingship, and the person who holds kingship is very responsible and calm, so it embodies a calm character.

The word gram, which stands for jade, is a neutral word and is also possible. Caution is a cautious, rigorous and very careful feature. The inscription represents unforgettable meaning, which embodies the meaning of foresight, Excellence and modesty.