DIY hence the messiness at the edge XD
I achieved the two colours in that shape with the aid of stickers:
Got these from Nature Republic...There are three kinds of sticker shapes to suit your preferences. I used the centre ones.
All nail polishes from Elianto; Blue Splash, Coral Light and a transparent coat for a shiny finish.
I painted Coral Light first and then waited for it to dry before applying the sticker and finally painted Blue Splash on top and finished it off with the top coat. If you're an expert, you may not even need the aid of the stickers =)