This has been on my list to try for way too long! I'm not big on layering, but I'm totally reformed. I have a few CND layering polishes but now I want them all!
This is layered over Borghese Stellare Notte, which is a deep blue (see swatches here). All I can say is Chrimson Sparkle is amazing! Depending on how what you layer it over and what way you look at it, it flashes redish, orange, and yellow. I thought it looked great over navy, next time I'm going to try black! I think I'll buy jade or copper sparkle next. CND is not too widely available here. It's mostly salons you can find CND at. They retail for about $8 CND.