The two kinds of cabochon edges that are most common. The example on the left is a cab with a dome that slopes right down to a sharp edge, and the one on the right shows a cab with a bezeled/flat edge. The flat edge is great for wire wrapping because it holds the wires that encircle the cab. This type of edge seems to be how the majority of cabs are cut, but I like the thin/sharp edge for beading. Many times the edge is rounded smooth, but if the cab has a good slope from the dome it will still work well for beading.
University of New Hampshire
COLA - Education
Thanks Barbara, those who are new to beading bezels will find this information helpful.