I don't think they are polishes. According to Nordstroms:
Nails dazzle with extreme radiance in a limited-edition, numbered set. Each coffret features two sparkling powders and a special adhesive base coat. The fine powders, in Black and luminous Gold, create a jewel-like manicure. Whether applied to one nail as an accent or as a complete manicure, Dior Sparkling Nail powders create an elegant, brilliant couture finish.
So basically you paint your nails with the adhessive base coat and then sprinkle on the powder? At least that is how I read it. Glitter for your nails in a nail polish bottle instead of in pouches with a base coat marketed as 'special adhesive'
They have some at my local nordies and appear to be available online again so I might go peek but the powder part of Sparkling Nail Powders means too much work for me. My nails look half arsed when the glitz is suspended in polish I cannot imagine how an extra step would make them look better :sniff: