Both of these are some of the most beautiful red glitters I've ever seen and both have a spot in my current (emphasis on current!) Top 20 from my stash.
Lippmann Ruby Red Slippers. Love!! This is my favourite rendition of the 'black with red glitter' polishes out there. It's also IMO, the best. The glitter is super shiny and isn't lost in the black base at all. This is two coats on black.
Milani Red Sparkle. First of all, I apologise for the awful photos. My camera completely spazzes at these glowy reds. I took a shot in lower light so that the actual glitter was easier to see - it's definitely not as orange as some of my pics make it look.
I've said this before but I'll say it again, the Milani One Coat Glitters are AWESOME! The depth of these are crazy. Lots of tone-on-tone stuff happening here. The glitter is very fine and the colours all blend together seamlessly on the nail so I swatched a little thinly on paper to try and work out the different glitters. From what I can see, there's a couple different shades of red as well as black glitter in there. So badass.