I used 3mm caramel bamboo from this laser supplies store but these earrings would also look great made from acrylic or other woods.

The earring hooks are easily found on Amazon or eBay made from sterling silver or stainless steel. You will also need some jump rings which are also very inexpensive and available online. 

These earrings can easily be designed in the free XCS software.

To make this design I just used four diamond shapes placed on top of one another and used the combine feature to unite the shapes together.

I then added a small triangle at the top to attach the jump ring.

These are the settings I used to cut 3mm thick bamboo on a xTool D1 Prp 5w.

Now all that is left to do is attach the jump ring to the small triangular. cutout at the top then add the earring hooks and your project is complete.