sold 5 units earrings with the same design

this Saturday afternoon, we sold five earrings with the same design! 

we have concrete jewellery and each basically in its own design. I wouldn't deny earrings have less design than necklace and bracelet as earring have limitation at its size, by that we should repeat the design of earrings. 

around noon, a girl bought a bracelet and earring. then we made that earring with the same design, after 30mins, that earring was sold. then we made another one, again it's sold after 30mins and this happened in the rest of the afternoon. in total 5 units were sold! 

that's mysterious we had not made any promotion on it and that design was there for quite a while