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.
An attachment to a person, proceeding from intimate acquaintance, and a reciprocation of kind offices, or from a favorable opinion of the amiable and respectable qualities of his mind. Friendship differs from benevolence, which is good will to mankind in general, and from that love which springs from animal appetite. True friendship is a noble and virtuous attachment, springing from a pure source, a respect for worth or amiable qualities. False friendship may subsist between bad men, as between thieves and pirates. This is a temporary attachment springing from interest, and may change in a moment to enmity and rancor.