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.
Gemstones are a good way to add the properties of a color to your life. Worn close to the skin, in receptive areas (pulse points) - the wrist, earlobes, neckline, fingers and ankles... benefit from the crystal vibrations and help to align the chakras with the properties it needs for each color.