#1 Could be either copper or alum. you'll have to clip a couple of strands and look at the center for sure.
#2 Most buyers pay the same for either kind of ram, just throw it in the same box. Just look at their pricesheets for that answer. As an example, HERE;
Memory (RAM)
Mixed Memory (Silver, Gold, Tin Finger)- $14.50 per LB
RAMBUS (Metal Covered RAM)- $6.50 per LB
Trimmed Memory - $6.60 per LB