Answer the Question Above You

I'd want the ability to make someone think of a word. Just, like, shove it in their subconsciousness. Maybe they'll accidentally say it? More likely, they would just think Why did I think of toast just now? I mean, I'm sure there's probably a really cool application of this power, like influencing someone who makes important decisions, but this seems impractical enough to count, maybe.

What is your favorite gemstone? Is it for looks, or for symbolism?