The cocobolo on my Sarells Sierra is kind of unique. It's nothing that's just absolutely wild, but I've never seen anything else like it. The grain pattern runs in undulating waves and it has wide, deep fiddleback figuring to it. It's very difficult to photograph under the matte finish but in sunlight it plays and dances around like a holograph.
In person it is colored almost like half way between a lighter piece of walnut and that reddish cordovan leather color. The grain is a very dark grey like 70-80% black in a paint or spreadsheet. The lightest areas between the grain and in the figure turn up to a reddish orange color. It's not expedition grade cocobolo, but it's just special enough to be unique and grown on me.
Here are some photos before and after the home-made grip was installed in various lighting conditions...
Summer time, direct overhead, no clouds:
Summer time, partly cloudy, about 1.5-2 hours before sunset:
Indoors at night with flourescent lamps on to help show the figure thats hard to catch with a camera in full, direct lighting:
Hope this helps.