This rough for this gemstone is from Nigeria and I have seen quite a bit of it. The body is a nice pink, but some faces of the crystal have a yellowish green layer on them that appears to have been sprayed on them. It is all natural and the layer is deep enough to be incorporated into the finished gemstone. When the yellow green and pink mix they have the right tone level to produce a yellow. Now there is very little yellow green in the pavilion of this oval and that makes the yellow spot, made by mixing, seem to bounce around as you turn and twist the stone. The oval is clean and bright and makes a nice play ground at 1.87 carats.