I am not a Native American jewelry fan in general, so I don't own anything of significance. But DH has always been deeply interested in Native American things of all kinds, and tried diligently to get me to like Native American jewelry when we were first married. He showed me lots of pieces from different places we traveled, and I remember being interested in how the materials that were most available in the area were what were used in the jewelry, and bone pieces were quite common among plains and hills area tribes. I specifically remember him trying to buy me something like this (I do not know the provenance of this piece nor if it is even Native American made, but it looks similar to what he wanted to buy), which was made out of two different colours or finishes of bone:

