Black opal. I also love tanzanite, but there’s just something about black opals. It’s so unusual that it gets a lot of comments.

Iolite – what an interesting choice! I love how it can look 3 different colors in three different directions! (You’ll love unheated Tanzanite (Zoisite) too if you like pleochroism! It shows Red, Blue and Yellow!)

I like too many stones to list! But I love Red Spinel most for its cute octahedral crystal habit which you can set without polishing or cutting. In Burma, they believe that Spinel crystals were polished by spirits! Isn’t that romantic? Spinel also has a fabulous luster and brilliance.

azonite

Peridot because it’s ultramafic and my birthstone. And hats off to the rutilated quartz lover too. I like that as well. One of my professors has some he uses for teaching mineralogy.

Big fan of garnets, actually. A deeper, sometimes muddier or purpler red than rubies.

My favorite is opal b/c it is my birthstone & I love the play of colors. Opal is amorphous in that it doesn’t have crystals but instead has water inside it’s structure. That is what gives it that fiery range of colors.

I love moonstone which is the mineral feldspar that has been cut & polished. Pictured here:

Purple, rose & smokey quartz are all the same, SiO2 that comes in different colors. I like them all. By the way, most people don’t know that amethyst is purple quartz!

If you have ever seen rutilated quartz, it is awesome as well. It has the mineral rutile which looks like tiny needles inside the quartz. It makes for some interesting jewelry. See for yourself:

I love Amythist, I know it’s worth like 0.1 dollars per ounce, but the lovely purple with terminated white and clouded black, love it.

London Blue topez

I’m going to say a opal although it’s a stone I love the milky backround.It is marked with colors that change in the light.

I like Amethyst because of it’s color, transparent purple.