Yes, well, it’s depending on the type of material. Not very user friendly but they have different names. I suppose it comes from how the material is built/channeled.
For example, the emissive color level on a PBRMaterial can be set using *Intensity (i.e. emissiveIntensity). And then, I believe you cannot set a color level for the albedo in PBR. I suppose it would work through the environment intensity or by setting a lightly darker or brighter albedo color (like a light grey instead of white). Or the other way round, push the environment level intensity above 1. I’m not sure whether you can scale an albedoColor? 
You can give it a try but it looks like it doesn’t apply to your current choice of material. Did you get a chance to check out the other options? (Searching for diamond in the forum)
Edit:
Here are a couple of links you may want to visit:
And then, there’s more… try search for em in the forum and be curious… before you make your final decision on which approach/design to use (my recom).
Meanwhile, have a great day 