A relatively complete video of my process, from start to finish. Greatly condensed, especially with the polishing.
0:00 The rough stone/flattening the bottom
1:04 Marking/flattening the top
3:50 Marking the inside and outside shape
5:04 Carving/grinding the inside
6:14 Cutting away the outer shape
7:03 Grinding outer edges/inner
7:32 Removing a bit more material from the bottom
10:04 Smoothing the outer edges to the marked edges
10:42 Aligning the stone with the turntable to find the bottom center
11:10 Shaping the exterior
15:29 Fine grinding before polishing
16:03 Dry polishing 50/100/200/400, wet polishing 800-1500
17:00 Final result
https://www.etsy.com/shop/WardStoneCrafts
https://www.amazon.com/s?me=A1AGAQG72KGH9Y