I guess this is sedimentary rock, but I don't think I've ever seen (in person) one with such a clean dividing like between the colours. When I saw it, I knew I had to make something interesting from it.
I used a variety of carbide drill bits to make the hole, ending with 3/4" diameter that fits my ring finger.
I then did the rough cutting with a diamond blade in my angle grinder and the final shaping on my belt grinder using silicon carbide belts.
The last step was to dunk it in polyurethane to let that soak in and help stabilise the fairly delicate sand stone.
Even though I don't think I'll actually wear this ring, it was a fun challenge to make it, and I may find another use for the rest of the rock for an future project.

Plans for the wooden belt grinder I used in this video:
https://ibuildit.ca/plans/2x72-belt-g...

Ways you can help support this channel:
Patreon:
https://www.patreon.com/user?u=865843...

Plans for sale: https://ibuildit.ca/plans/

More videos on my second woodworking channel:
   / ibuildit  

My home reno channel:
   / ibuildithome  

My "Scrap bin" channel:
   / ibuilditscrapbin  

Website: https://ibuildit.ca/
Facebook:   / i-build-it-258048014240900  
Instagram:   / i_build_it.ca