This looks attractive and professional but is really easy to do. Switch the colours around for a different look, you could try pinks or greys.
Step 1: paint the upper diagonal section of your nail in a dark blue polish.
Step 2: wait for it to dry and then swipe a thick black line of nail polish just next to the dark blue.
Step 3: wait for the black to dry then paint the lower diagonal section in pale blue polish.
Step 4: wait for the pale blue to dry then use a thin brush to paint a sparkly silver line either side of the black.
Step 5: wait for it to dry then using a small dotting tool, cover the black area in white spots.
Step 6: wait for it to dry then finish with a clear topcoat.