No really. We apply this word to the gemstones that exhibit a phenomena like color changes and movement. We love color. Color that moves is guaranteed to move you.
First phenomena. One of the rarest and most romantic minerals on the planet, Alexandrite. This stone spends all day as a teal green, but by candlelight (when you present it to your loved one) it changes quite dramatically to a deep reddish purple. Notice the row of matching color change Alexandrite's surrounding it in a sparkling platinum and diamond setting.
Only you would know if it's time to step up. If it is this should be your move.