I made a tutorial for all of you on how to do these gemstone/rupee nails that I did a little while ago! The concept was originally inspired by a wood block painting tutorial done by Fabric Paper Glue, but I just loved the illusion and look of it so much that I wanted to adapt it to nail art!
Step 1: Getting Started
This tutorial requires only three colors: Your basic color, black, and white. You will be mixing these colors to create the 6 shades needed to complete the look. In the top right corner, you can see that I've illustrated a sort of "paint by number". The number 3 shade is the color right out of the bottle. The number 1 shade has the most white mixed in (I used about 3 globs of white polish), and your number 6 shade has the most black (I used two small globs of black polish). Be careful when you first mix in your black polish - black can be very overpowering and will make the color very dark very fast! Remember: you can always add more as needed!
Step 1: paint your entire nail with your #3 shade. Allow polish to dry completely (that is super important! if you don't allow it to be completely dried, you will get yucky marks from the tape later on)
Step 2: The Sides
Step 2: take two pieces of striping tape and line two parallel areas running longways on either side of your nail. These two areas should be more narrow than the center area.
Step 3: fill in the left area with your #1 shade (lightest), and the right area with your #6 shade (darkest). It's okay if its a little messy - that's why you have the tape! Allow polish to dry completely before pealing up the tape.