I am trying to do a retexture of some jewelry objects, and the worn object nif seems to be changing the colors of the jewels in the piece from the color they are in the diffuse map I've made in photoshop. For example, if I make a white jewel texture, it is showing as pinkish in game, and my yellow jewel shows as orange. The ground object does not alter the colors of the same diffuse map texture. This suggests that there is some property of the worn object nif that tells the lighting to add a reddish tint to the color of any diffuse map shown there.

Does anyone far more familiar with nifs than I know what branch and property that is in the nif so that I can edit it to not alter colors on the diffuse map when displaying them?

Maybe it is related to an environment map which can make a slightly color variation. Check if there are other textures in use. Also check if there is an emittance value above 0.

I'll check on the emittance value, but I definitely already removed all the environment maps. I am using a custom texture set in the CK for all variants.

Under what heading will I find emittance value, and ought I to change it to 0?

Yes, unless you want the jewelry illuminated by self, you'll have to set the value to 0 .

But where is it?

Could it be one of the unknown float settings? It is all that I can find different between the ground object and the worn object.

There is in the shader material node.

I don't see any "ShaderMaterial", but there is BSLightingShaderProperty. There's no setting for "emmitance" there. (I am using Nifskope 1.1)

I'm at office now, so I don't remember correctly, sorry. When I come back to my home, I'll post a screenshot to you

Somehow I think you're confusing emittance with Emissive Color, which is certainly a color setting inside BSLightingShaderProperty.