Apply dark glitter purple acrylic to the bottom of the nail. Apply medium glitter purple acrylic just above, overlapping a bit with the dark purple. Apply light glitter purple acrylic just above, overlapping a bit with the medium purple. Apply very light glitter purple acrylic just above, overlapping a bit with the light purple.

Use a detail nail art brush and white acrylic craft paint to draw a heart-shaped locket and a key.

Fill in the heart with a thin coat of sparkle nail polish. Use the detail nail art brush and black acrylic craft paint to add a keyhole. Attach the lock to the key by adding a “chain” of clear rhinestones.