These objects are actually opercula shells used to "close" the shell. The lids have 2 distinct sides: the first is white, flat with an orange spiral, the second is domed, the more often orange, Brown and black with shades of one piece to piece.
The colorful side is beautiful to behold: smooth, shiny, with intense colors, it is a fascinating object. Allows the creation of jewelry, decoration or whatever your mind can imagine :)
Size varies between 1 and 2 cm.
Sending treated to preserve the lids. If you would like more information, feel free to contact me ;)