Let curiosity lead
There are wonderful traditions around crystals, but I do not believe choosing one needs to feel like a test. Curiosity is a beautiful compass.
Notice which color makes you pause. Pick up the stone that seems to have a little gravity. It may be the sparkle, the shape, or simply the memory it stirs. That first quiet response is enough.
Learn the lore if it delights you, then make the relationship your own. A crystal can be a reminder, a keepsake, or just a lovely piece of the earth to place where morning light can find it.