Learned a few things

Rounded bezel -
Trying to round it on the 220grit sanding step was not good enough. I'll try doing it on the 220grit grinding step in the same manner as rounding the peak of the dome in the 100grit grinding step.

Scratches -
In the cab books I saw mention of scratches and getting rid of the previous step's scratches before moving on. I had thought that I had not seen that until this batch. But that isn't the case. On a few of my found rocks I saw scratches show up at polishing that I thought came from me being sloppy and hitting the arbor nut.

After the scratches came up on the obsidian I decided that I'd use my loupe on the stone before moving on. I was surprised at how often they showed up. In most of the materials I was able to go back and work it out. But on a few (petrified wood mainly), further work made more scratches. In those cases I'd try to minimize the scratch and then work it out on the next grit.

1200 diamond grit -
It arrived just in time.

I found that it cut much slower than the tripoli but I had no undercutting. It also runs hotter. I needed to swap out the stones that I was working in order to keep them cool enough to stay on the dop.

On some rocks I was beginning to think that it didn't give as good of a polish as the tripoli, but I'm not sure. It shined the clear areas on the crazy lace agates to a high gloss. So in this case, I'm thinking it was the material that didn't give a high gloss with 1200grit. Based on that assumption I was tempted to break out the cerium oxide. However, I was worried that it would chew the material up like the tripoli.

I had bought 14K diamond grit along with the 1200, but forgot to buy the second uncharged disk.

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Regardless, I'm left thinking that not only should I get 50K grit in case I run across more stones with very soft parts but maybe a grit somewhere around 800-1000 because the 1200 is pretty slow.

Update:
I had another thought regarding the 1200 diamond grit.

I've been buying the cheapest paste (5gr for ~$5 (cheaper diamond paste has less diamond)) and it has worked well because I try to do all the primary work on the wheels. By that I mean I don't want it to cut fast. But I wonder if I higher density diamond paste would take care of the slowness I'm seeing.