Thanks to all, and yes Steve, tagua is a nut that grows on tagua trees (alot like a palm tree) down in the amazon basin in south america. The inside of the nut, once dried, is a vegetable ivory, pretty much identical to animal ivory, but renewable. They are maybe half again the size of a walnut.
I buy whole nuts, mainly cuz I wanted slices that were a little thicker than what I was finding pre-sliced. Basically, I belt sand (50 grit) the nut untill I get the face of the slice the size I want, then use a table top band saw w/ a home made fence to cut the slice (I have a special push stick I made for this), then I smooth up the face and back on the circular sander (400 Grit). and I have a slice ready to cut. After I cut the slice I clear coat the bark around the edges to lock it down (it would eventually flake off). I do this with the pattern paper still on the face so I only coat the bark. Since this is basically ivory, cleaning off the spray adhesive and pattern paper is a snap with mineral spirits. Drill a hanging hole, and you've got a necklace.
Alot of the locals in South America carve whole nuts into chess set pieces, which I find amazing as thats outside my skill set.