Wouldn't do the gem, but just a dot of paint instead, but love the design! Ameeei, by Mais
50 Vivid Summer Nail Art Designs and Colors 2016 - Page 2 of 2 - Latest Fashion Trends
You can probably get a false nail with the white and pink checkered design to get this nail art design. There are also some vinyl stencils you can use. Or complete the whole look with available decals with various designs for sale.