I recently moved to okc from Texas. I know there's some interoperability, and that Toll Tags are accepted. However, I have a TxTag, similar to a toll tag, but put out by TxDot.
Topaz is commonly used for Friendship Rings and it is nicknamed 'the gem of friendship'. Topaz is considered in some cultures to be the ultimate representation of friendship and fidelity.
One of the most important details in a friendship is to never leave or forsake the other. A friend is also loyal, for example in the movie Lord of the Rings, Froto and Sam Wise had a wonderful fellowship. They lived in peace and in one accord.