To get the sharp line between the white and black I first painted my nails white. Then I waited for a few hours to make sure it really had dried. It is really important that it's completly dry because now I took a piece of tape on half of my nail and painted the other half with a black polish. I needed two coats of it and then I removed the tape before it had dried and then I had a sharp line.
I know it's not perfect but it was the first time I tried doing something like this.
I used two different gold glitters on my ringfingers so make them really sparkly.