I'm thinking diameter, for now... I can't measure depth either, but I'd love to find out what Gear can do with these.
Pics of my semicustom set? Those aren't Gear's work (except on the placeholder Showdowns I used instead of green/black/purple Spirits since I couldn't find them). I did those with off-the-shelf 1 inch paper labels off Amazon. I can take pictures, but I likely won't have time for a few days.