This is 2 coats of Nfu Oh GS14.
GS14 is the perfect holo glitter black polish. It lays so flat and is opaque. It shines so wonderfully in person and just... is amazing. It's hard to find a thicker glitter polish that lays THIS well.
Brand: Nfu Oh
Availability: As far as I know, the only US carrier for Nfu Oh Is here where I bought it.
Price: Originally it's $12.50 and it is now on sale for $10.65