The dark grey charcoal metallic above is China Glaze First Dawn. It has tiny flecks of multi-colored glitter in it that don't show up very clearly but make for a nice overall shimmer. As with most metallics I've tried, there is a little bit of streaking but I like the look of it.
Here's the polish before I started stamping:
I used flowers from GCOCL (fauxnad) plate F01.
If you don't have the GCOCL plates, there are very similar flowers on Konad plates m51 and m57: