It's combination of pink, green and blue shades with blue undertone.
For imitation this gemstone you need opaque white nail polish as base color and some flake nail polish.
My flakes have very weak green color so I added Holographic top.
Nail polishes used:
- White — Sally Hansen Hard as Nails
- Flakes — Aurelia 137 Magnifique
- Holographic top — INM Out the Door Silver Lining
O really don't like when opal gemstone imitate with sponge — it looks cheap in real life. Opal should shine.