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.
Quick Answer. Amethyst and turquoise are the traditional sixth-anniversary gemstones, and the colors purple, turquoise and white can be incorporated into gifts. The traditional themes for a sixth anniversary are sugar and iron. The modern alternative is wood.