I did not do proper gradient in a while, so here is one that include following colors:
Revlon - Lily - lightest of the purple, Sally Hansen - Good to grape, and Sinful Colors - 24/7 (neon pink) and Mariposa - Neon orange.
For stamping I used images from Messy Mansion MM 14, and I stamped with following polishes: Mundo de Unas - White, Black and Copper and MoYou London - Dark violet.