Shells are great bases for making jewelry and this method of making shell jewelry could be a starting point. These earrings are made by using just shells and glitter glue.
Glimpse of the Result:
Take two shells of the same pattern and size. Remove impurities if any.
Attach small loops to the earring. This should be ideally done after making a hole using a driller. However, for making at home, I used M Seal (alternatively any self hardening clay) to attach the loops.
Using glitter glue, make the design of your choice. Allow it to dry.
Attach earring hoops and the simple pair of earrings is done.
You could apply a coat of clear varnish to protect the glitter design.