Strand Shell Red spiny a RondelleØ 20 mm

The Shell It's composed by Mineral substances like thearagonite and the soccer phosphate; And from organic substances like conchiolin Which is a protein. The mineral substances, joined by the chain, are arranged in layers that take the name of peròstras, mesòstraco and endòstraco.

Since ancient times it is One of the materials used by man as a ornament and jewel, often engraved with various shapes and designs that highlight the nuances and colors, which can vary from white, pink, orange, yellow to blue, black, green, etc.