I need "silver" colored wire to run through chain for hanging lamp to connect to ground where it mounts to ceiling
You could get tinned (thus, silver-colored) bare copper wire of the proper gauge from an electronics supply house. This is commonly available.
Evidently there is also nickel-plated copper wire available, but it's far less common.
I think you could also use twice as much of the &quot;lamp wire&quot; in the color you like, using the extra &quot;lamp wire&quot; as a grounding wire, but there might be some subtle reason that would not be OK I haven't thought of.