How to make a solid ebony ring using only a dremel

Today I make a solid ebony ring using some larger square pieces I had lying around. No lathe is used, only the Dremel with its various attachments - predominantly the drum sander. The sanding grits I use are in this order.
80 - 240 - 320 - 400 - 800 - 1000 - 2000 - 3000
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