One is a tumbled clear quartz that has flaws that make rainbows and I never tire of looking at it, I also like my selenite, obsidian and smokey quartz's because they all feel alive to me.
I've always loved amythest. But then again I love the colour purple too, LOL.
I keep a piece of amythest in my crystal pouch under my pillow, wear amythest earrings and have a bracelet made of it too.
More specifically hematite spheres.
I have a necklace of round hematite beads that holds a pentacle charm with a small hematite sphere in the center. My wand has a sphere on the tip. Mty favorite piece is the 50mm sphere that I use as a focal point for scrying, and grounding.
Kyanite
I've only been keeping company with it a short while but....OMG
Hmmm. Favorite stones ... but there are so many! My very favorite is green tourmaline. I also love Lapis, Amber, Jade, Sapphire and Ruby. Just to name a few.