In no specific order, here are my favorite five gemstones. Let me know what yours are in the comments!
Amethyst - I love purple, so this isn't surprising.
Citrine - I'm absolutely in love with the pale shades of yellow that citrine comes in. Unfortunately it's not the greatest color for my skin tone, but boy do I love looking at it!
Kyanite - There's something strangely fascinating about this stone. It looks kinda dull and murky at first, but then you realize there is so much more to it! I really like the shades of blue with the silver luster.
Magnesite - I've made a few pieces of jewelry that's solely for myself and not for purchase, and a large portion of those pieces are made using this stone. The off-white cream color is an absolute dream, and the brown veining provides some visual interest.
Lapis Lazuli - A deep, royal shade of blue with gold splotches and veins. Simply stunning.