From the website:

I made these earrings as a gift for women in my family, last year. They are fast to make, and you can make them different every time, depending on the thread you choose or the amount of beads you use. Topstitching thread and seedbeads to make tiny, delicate earrings; cotton thread and cat’s eyes beads for bigger and distinctive ones.
The instructions in Spanish for these pieces are at my blog http://curupisa.blogspot.com

Finished Size

With topstitching thread and seed beads, 1/2’’ (1,25 cm).
With a thicker cotton thread, aprox. 1’’ (2,5 cm)