Ex-libris (Latin word for "from the books") is also referred to as a bookplate. It was used to denote ownership. When stamped on books or literature, it meant that this book or text belonged to me.
In the same sense, it can be seen to mean that your journal is special and uniquely yours.
 
The collection includes the following stamps: 
Ex-libris flower frame 4.5 x 6.5cm
Telling secret 3 x 5cm
Ex-libris Little Angel 3 x 4.5cm
House 3.5 x 5cm
Ex-libris Lily of the Valley  3 x 2cm
Quote 6 x 1.5cm
 
Also available as a set of 6,